| **Acquisitions, Divestitures, Collaborative Arrangement and Equity-Method Investment - Narrative (Detail) (USD $)Share data in Thousands, unless otherwise specified** | 3 Months Ended |             |                | 4 Months Ended | 3 Months Ended |               | 0 Months Ended |               | 0 Months Ended |                 |               |               |               |             |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-------------|----------------|----------------|----------------|---------------|----------------|---------------|----------------|-----------------|---------------|---------------|---------------|-------------|
||
| **Significant Acquisitions and Disposals [Line Items]**                                                                                                                |           |        |           |           |           |          |           |          |           |            |          |          |          |        |   |   |   |   |
| Collaborative Arrangement, Payments Received                                                                                                                           |           |        |           |           | $ 60,000,000   |          |           |          |           |            |          |          |          |        |   |   |   |   |
| Collaborative Arrangement, Collaborator's Revenue and Expense Ownership Percentage                                                                                     | 60.00%         |        |           |           |           |          |           |          |           |            |          |          |          |        |   |   |   |   |
| Collaborative Arrangement, Company's Revenue and Expense Ownership Percentage                                                                                          | 40.00%         |        |           |           |           |          |           |          |           |            |          |          |          |        |   |   |   |   |
| Business combination, consideration transferred, including equity interest in acquiree held prior to combination                                                       |           |        |           |           |           |          |           |          |           |            |          |          |          | 442,000,000 |   |   |   |   |
| Business combination, recognized identifiable assets acquired, goodwill, and liabilities assumed, net                                                                  |           |        |           |           |           |          |           |          |           |            |          |          |          | 519,000,000 |   |   |   |   |
| Identifiable intangible assets, excluding in-process research and development                                                                                          |           |        |           |           |           |          |           |          |           |            |          |          |          |        |   |   | 474,000,000 | 45,000,000 |
| Net deferred tax liabilities                                                                                                                                           |           |        |           |           |           |          |           |          |           |            |          |          |          | 166,000,000 | 94,000,000 | 69,000,000 |   |   |
| Goodwill                                                                                                                                                               | 43,752,000,000 |        | 44,672,000,000 |           |           |          |           |          |           |            |          |          |          | 89,000,000  | 322,000,000 | 192,000,000 |   |   |
| Long-term Debt, Gross                                                                                                                                                  |           |        |           |           |           |          |           |          |           |            |          | 3,650,000,000 | 3,650,000,000 |        |   |   |   |   |
| Identifiable intangible assets                                                                                                                                         |           |        |           |           |           |          |           |          |           |            |          |          |          |        | 362,000,000 | 181,000,000 |   |   |
| Debt instrument, unamortized discount                                                                                                                                  |           |        |           |           |           |          |           |          |           |            |          | 10,000,000    |          |        |   |   |   |   |
| Initial public offering, long-term debt assumed, parent                                                                                                                |           |        |           |           |           |          |           |          |           |            |          | 1,000,000,000 |          |        |   |   |   |   |
| Cash Proceeds From Exchange of Stock                                                                                                                                   |           |        |           |           |           |          |           | 2,500,000,000 |           |            |          | 2,500,000,000 |          |        |   |   |   |   |
| Initial public offering, cash proceeds received, parent                                                                                                                |           |        |           |           |           |          |           |          | 6,100,000,000  |            |          | 2,650,000,000 |          |        |   |   |   |   |
| Subsidiary or equity method investee, cumulative number of shares issued for all transactions                                                                          |           |        |           |           |           |          |           |          |           |            | 99,015        |          |          |        |   |   |   |   |
| Repayments of Short-term Debt                                                                                                                                          |           |        |           |           |           |          |           |          |           |            | 2,500,000,000 |          |          |        |   |   |   |   |
| Noncontrolling interest, ownership percentage by noncontrolling owners                                                                                                 |           |        |           |           |           |          |           |          |           |            | 19.80%        |          |          |        |   |   |   |   |
| Proceeds from issuance of common stock                                                                                                                                 |           |        |           |           |           |          |           |          |           |            | 2,300,000,000 |          |          |        |   |   |   |   |
| Sale price for discontinued operation                                                                                                                                  |           |        |           |           |           |          |           |          |           | 11,850,000,000  |          |          |          |        |   |   |   |   |
| Net gains on asset disposals                                                                                                                                           | (26,000,000)   | (7,000,000) |           |           |           |          |           |          |           | (4,800,000,000) |          |          |          |        |   |   |   |   |
| Equity method investment summarized financial information, equity                                                                                                      |           |        |           | 250,000,000    |           |          |           |          |           |            |          |          |          |        |   |   |   |   |
| Equity method investment, summarized financial information, current assets, cash                                                                                       |           |        |           |           |           |          | 122,500,000    |          |           |            |          |          |          |        |   |   |   |   |
| Equity method investment, ownership percentage                                                                                                                         |           |        |           |           |           | 49.00%        |           |          |           |            |          |          |          |        |   |   |   |   |
| Gain associated with Pfizer's equity-method investment in China                                                                                                        | 490,000,000    | 0           |           |           |           | 490,000,000   |           |          |           |            |          |          |          |        |   |   |   |   |
| Equity method investment, summarized financial information, gain (loss) associated with indirect retained interest                                                     |           |        |           |           |           | 240,000,000   |           |          |           |            |          |          |          |        |   |   |   |   |
| Fair value inputs, discount rate                                                                                                                                       |           |        |           |           |           | 12.00%        |           |          |           |            |          |          |          |        |   |   |   |   |
| Equity method investment, aggregate cost                                                                                                                               |           |        |           |           |           | 1,300,000,000 |           |          |           |            |          |          |          |        |   |   |   |   |
| Equity method investment, underlying equity in net assets                                                                                                              |           |        |           |           |           | $ 686,000,000 |           |          |           |            |          |          |          |        |   |   |   |   |
| Finite-lived intangible asset, useful life                                                                                                                             |           |        |           |           |           | 25 years      |           |          |           |            |          |          |          |        |   |   |   |   |

| X                                                                                                                                                                                                                                                        |
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| - Definition
Cash Proceeds From Exchange of Stock
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| - Definition
Collaborative Arrangement, Collaborator's Revenue and Expense Ownership Percentage
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Collaborative Arrangement, Company's Revenue and Expense Ownership Percentage
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Collaborative Arrangement, Payments Received
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| - Definition
The sales price of the discontinued operation.
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| - Definition
Equity Method Investment, Summarized Financial Information, Current Assets, Cash
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| - Definition
Equity Method Investment, Summarized Financial Information, Gain (Loss) Associated with Indirect Retained Interest
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| - Definition
Excess Consideration Above Net Book Value of Divested Interest
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| - Definition
Initial Public Offering, Cash Proceeds Received, Parent
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Initial Public Offering, Long-Term Debt Assumed, Parent
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| - Definition
Amount of acquisition cost of a business combination allocated to noncurrent deferred tax assets net of valuation allowance and noncurrent deferred tax liabilities.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the sum of the: (1) acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer and (2) the acquisition-date fair value of any equity interest in the acquiree held by the acquirer prior to the business combination (for example, a step acquisition).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of identifiable intangible assets recognized as of the acquisition date.
+ References
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| - Definition
The net amount recognized as of the acquisition date for the aggregate identifiable assets acquired in excess of or less than the aggregate liabilities assumed.
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| - Definition
Net amount recognized for aggregate assets, including goodwill, in excess of or less than the aggregate liabilities assumed (also referred to as net assets acquired). This amount may also be viewed as incremental amount of equity that the consolidated entity (including the portion attributable to a noncontrolling interest) will recognize as a result of the business combination.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.
+ References
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| - Definition
This element represents the aggregate cost of investments accounted for under the equity method of accounting.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity.
+ References
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| - Definition
This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value.  For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net gain (loss) resulting from the sale, transfer, termination, or other disposition of assets during the period, excluding transactions involving capital leases, assets-held- or available-for-lease, and other real estate owned which, to the extent appropriate, are included in gains (losses) on the disposition of assets in nonoperating income (expense).
+ References
No definition available.
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| - Definition
Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 34 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| X                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cumulative number of shares issued or sold by the subsidiary or equity method investee on all stock transactions.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H
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