| **Long-Term Debt (Details) (USD $)**                                                                                                                                                                                                                                             | 12 Months Ended |     | 0 Months Ended  | 12 Months Ended | 0 Months Ended       | 12 Months Ended      |     |                   | 12 Months Ended | 0 Months Ended    | 12 Months Ended   |                   | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|-----|-----------------|-----------------|----------------------|----------------------|-----|-------------------|-----------------|-------------------|-------------------|-------------------|-----------------|
||
| **Debt Instrument [Line Items]**                                                                                                                                                                                                                                                 |            |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Debt                                                                                                                                                                                                                                                                             | $ 4,843,000,000 |     | $ 4,123,000,000 |                 |                 | $ 0                  | [1] | $ 0               | [1]             |              | $ 0               | $ 328,000,000     |                 | $ 359,000,000 | $ 311,000,000 | $ 200,000,000 | $ 200,000,000 | $ 1,000,000,000 | $ 1,000,000,000 | $ 1,000,000,000 | $ 1,000,000,000 | $ 1,000,000,000 | $ 100,000,000 | $ 100,000,000 | $ 250,000,000 | $ 250,000,000 | $ 850,000,000 | $ 850,000,000 | $ 1,000,000,000 | $ 0 | $ 84,000,000 | $ 84,000,000 |   |
| Interest Rate                                                                                                                                                                                                                                                                    |            |     |            |                 |                 | 0.00%                | [1] | 0.00%             | [1]             |              | 0.00%             | 1.79%             | [2]             | 0.00% | 0.00% | 5.25% | 5.25% | 8.25% | 8.25% | 5.25% | 4.15% | 4.15% | 7.25% | 7.25% | 8.00% | 8.00% | 6.00% | 6.00% | 5.25% | 0.00% | 7.25% | 7.25% |   |
| Debt Instrument, Maturity Date                                                                                                                                                                                                                                                   |            |     |            |                 |                 | Oct.				03,				 2018 |     | Oct. 14,				 2016 |                 |              | Sep. 30,				 2013 | Sep. 30,				 2013 |                 |   |   | Apr. 15,				 2014 | Apr. 15,				 2014 | Mar.				01,				 2019 | Mar.				01,				 2019 |   | Dec. 15,				 2021 | Dec. 15,				 2021 | Oct. 15,				 2023 | Oct. 15,				 2023 | Apr.				01,				 2027 | Apr.				01,				 2027 | Mar.				01,				 2041 | Mar.				01,				 2041 | Nov. 15,				 2043 |   | Aug.				01,				 2097 | Aug.				01,				 2097 |   |
| Debt Instrument, Maturity Date Range, Start                                                                                                                                                                                                                                      |            |     |            |                 |                 |                 |     |              |                 |              |              | Sep. 30,				 2012 |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Unamortized Discount                                                                                                                                                                                                                                                             | (19,000,000)    |     | (15,000,000)    |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total Debt, Net of Discount                                                                                                                                                                                                                                                      | 4,824,000,000   |     | 4,108,000,000   |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Long-term Debt and Capital Lease Obligations, Current                                                                                                                                                                                                                            |            |     |            |                 |                 |                 |     |              |                 |              | (200,000,000)     |              |                 | (58,000,000) | (48,000,000) |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Notes and Loans Payable, Current                                                                                                                                                                                                                                                 | (200,000,000)   | [3] | (324,000,000)   | [3]             |                 |                 |     |              |                 |              |              | (324,000,000)     |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Long-Term Debt Due After One Year                                                                                                                                                                                                                                                | 4,566,000,000   |     | 3,736,000,000   |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Unamortized Debt Issuance Costs                                                                                                                                                                                                                                                  | 41,000,000      |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   | 6,000,000 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Debt Issuance Proceeds Used To Extinguish Outstanding Debt                                                                                                                                                                                                                       |            |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   | 900,000,000 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Offering Date                                                                                                                                                                                                                                                   |            |     |            |                 | Oct.				03,				 2013 |                 |     |              |                 | Sep. 30,				 2011 |              |              |                 |   |   |   |   |   |   | Nov.				08,				 2013 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Debt offerings proceeds, net of discount and underwriting fees                                                                                                                                                                                                                   |            |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   | 985,000,000 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Installment payment amount for joint venture partnership                                                                                                                                                                                                                         |            |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 328,000,000 |
| Line of Credit Facility, Maximum Borrowing Capacity                                                                                                                                                                                                                              |            |     |            |                 | 4,000,000,000        | 4,000,000,000        |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Credit facility fee rate basis points, minimum                                                                                                                                                                                                                                   |            |     |            |                 | 0.125%               |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Credit facility fee rate basis points, maximum                                                                                                                                                                                                                                   |            |     |            |                 | 0.30%                |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Credit facility interest rate, Eurodollar rate plus, minimum                                                                                                                                                                                                                     |            |     |            |                 | 1.00%                |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Credit facility interest rate, Eurodollar rate plus, maximum                                                                                                                                                                                                                     |            |     |            |                 | 1.45%                |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Credit facility aggregate short-term loans and letters of credit, maximum                                                                                                                                                                                                        |            |     |            |                 | 500,000,000          |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Credit facility covenant term debt to capitalization ratio maximum                                                                                                                                                                                                               |            |     |            |                 | 65.00%               |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Repayments of Long-term Debt [Abstract]**                                                                                                                                                                                                                                      |            |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 2014                                                                                                                                                                                                                                                                             | 200,000,000     |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 2015                                                                                                                                                                                                                                                                             | 0               |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 2016                                                                                                                                                                                                                                                                             | 0               |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 2017                                                                                                                                                                                                                                                                             | 0               |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 2018                                                                                                                                                                                                                                                                             | 0               |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Thereafter                                                                                                                                                                                                                                                                       | 4,284,000,000   |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total                                                                                                                                                                                                                                                                            | $ 4,484,000,000 |     |            |                 |                 |                 |     |              |                 |              |              |              |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                  |
| [1]Our Credit Agreement provides for a $4.0 billion Credit Facility. The Credit Facility is available for general corporate purposes.[2]Imputed rate based on the prevailing market rates for similar debt instruments at the date of assessment.[3]See Note 10. Long-Term Debt. |

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Maximum incremental aggregate short-term loans and letters of credit capacity under the terms of a credit facility.
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Amount of the fee for available but unused credit capacity under the credit facility, maximum
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Amount of the fee for available but unused credit capacity under the credit facility, minimum
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Adjustment maximum made to the stated Eurodollar rate to determine the effective rate.
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Adjustment minimum made to the stated Eurodollar rate to determine the effective rate.
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Repayment of outstanding debt from proceeds of debt issuance.
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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.
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Total amount of long-term debt maturing in years one through five and thereafter following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.
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| - Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
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| - Definition
Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.
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Date the debt instrument was offered for sale, in CCYY-MM-DD format.
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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.
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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).
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| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
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| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.
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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.
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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.
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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.
+ References
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601
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| - Definition
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601
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| - Definition
Sum of the carrying values as of the balance sheet date of the portions of all long-term notes and loans payable due within one year or the operating cycle if longer.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5
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| - Definition
The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585
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