| **Stock-Based Compensation (Narrative) (Details) (USD $)In Millions, except Per Share data, unless otherwise specified** |        | 9 Months Ended |         | 9 Months Ended | 3 Months Ended   | 9 Months Ended |                 |        | 1 Months Ended | 3 Months Ended | 17 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------|--------|----------------|---------|----------------|------------------|----------------|-----------------|--------|----------------|----------------|-----------------|----------------|----------------|----------------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                       |   |           |    |           |             |           |            |   |           |           |            |           |           |           |   |   |
| Unrecognized compensation cost related to stock options                                                                  |   |           | $ 16    |           | $ 10             | $ 255          | $ 255           |   |           |           |            |           |           |           |   |   |
| Weighted-average service period                                                                                          |   |           |    |           | 3 years 8 months |           | 1 year 8 months |   |           |           |            |           |           |           |   |   |
| Weighted-average grant date fair values of restricted stock rights granted                                               |   |           | $ 29.52 |           |             | $ 23.22        | $ 22.67         |   |           |           |            |           |           |           |   |   |
| Percentage range of shares received at vesting based on total stockholder return ("TSR")                                 | 0.00%  | 200.00%        |    |           |             |           |            |   |           |           |            |           |           |           |   |   |
| Percentage of target of presented shares granted that may potentially vest                                               |   |           |    | 100.00%        |             |           |            |   |           |           |            |           |           |           |   |   |
| Maximum number of common shares to be earned during the performance period, Grants                                       |   |           | 1.1     |           |             |           |            |   |           |           |            |           |           |           |   |   |
| Maximum number of common shares to be earned during the performance period, outstanding                                  |   |           | 1.9     |           |             |           |            |   |           |           |            |           |           |           |   |   |
| Amount of common stock authorized for repurchase                                                                         |   |           |    |           |             |           |            |   |           |           | 600             |           |           | 500            |   |   |
| Stock repurchase program, period in force                                                                                |   |           |    |           |             |           |            |   |           |           | 18 months       |           |           |           |   |   |
| Stock repurchased and retired during period, shares                                                                      |   |           |    |           |             |           |            |   |           |           |            | 4.0            | 32.0           |           | 12.2 | 24.9 |
| Repurchase and retirement of common stock                                                                                |   |           |    |           |             |           |            |   |           |           |            | $ 71           |           |           | $ 157 | $ 336 |
| Increase in number of shares authorized                                                                                  |   |           |    |           |             |           |            | 7      | 18             |           |            |           |           |           |   |   |
| Maximum number of shares authorized that may be cover under equity plan to new employees hire in the fiscal year         |   |           |    |           |             |           |            |   | 4              | 2              |            |           |           |           |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage range of shares received at vesting for stock units based on our total stockholder return ("TSR") relative to the performance of companies in the NASDAQ-100 Index for each measurement period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Grants
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Outstanding
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of shares increase approved (usually by shareholders and board of directors), for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Shares Authorized That May Be Cover Under Equity Plan To New Employees Hire In The Fiscal Year
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Target percentage of presented shares granted that may potentially vest
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Unrecognized cost of unvested share-based compensation awards.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased and retired during the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
+ References
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| X                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of a stock repurchase plan authorized by an entity's Board of Directors.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, 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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