| **Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions** | 3 Months Ended | 6 Months Ended | 29 Months Ended |        |         |
|---------------------------------------------------------------------------------------------------------------------|----------------|----------------|-----------------|--------|---------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Excess Tax Benefit from Share-based Compensation, Financing Activities                                              | $ 4            | $ 25           | $ 37            | $ 65   |    |   |   |
| Minimum                                                                                                             |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Percentage range of shares received at vesting based on total stockholder return ("TSR")                            | 0.00%          |           | 0.00%           |   | 0.00%   |   |   |
| Maximum                                                                                                             |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Percentage range of shares received at vesting based on total stockholder return ("TSR")                            | 200.00%        |           | 200.00%         |   | 200.00% |   |   |
| Market-Based Restricted Stock Units [Member]                                                                        |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Unrecognized compensation cost related to stock options and restricted stock rights                                 | $ 49           |           | $ 49            |   | $ 49    |   |   |
| Weighted-average grant date fair values of restricted stock rights granted                                          |           |           | $ 98.04         |   |    |   |   |
| Maximum number of common shares to be earned during the performance period, Grants                                  |           |           | 0.7             |   |    |   |   |
| Maximum number of common shares to be earned during the performance period, outstanding                             |           |           | 1.3             |   |    |   |   |
| Market-Based Restricted Stock Units [Member] | Target                                                               |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Percentage of target of presented shares granted that may potentially vest                                          | 100.00%        |           | 100.00%         |   | 100.00% |   |   |
| Employee Stock Option [Member]                                                                                      |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Unrecognized compensation cost related to stock options and restricted stock rights                                 | $ 5            |           | $ 5             |   | $ 5     |   |   |
| Weighted-average service period                                                                                     |           |           | 1 year          |   |    |   |   |
| Restricted Stock Rights [Member]                                                                                    |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Unrecognized compensation cost related to stock options and restricted stock rights                                 | $ 352          |           | $ 352           |   | $ 352   |   |   |
| Weighted-average service period                                                                                     |           |           | 1 year 9 months |   |    |   |   |
| Weighted-average grant date fair values of restricted stock rights granted                                          | $ 79.16        |           | $ 75.31         |   |    |   |   |
| May 2014 Repurchase Program [Member] [Member]                                                                       |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Amount of common stock authorized for repurchase                                                                    |           |           |            |   |    |   | $ 750 |
| Stock Repurchased and Retired During Period, Shares                                                                 | 0.0            | 0.0            | 0.0             | 1.0    | 9.2     |   |   |
| Repurchase and retirement of common stock                                                                           | $ 0            | $ 0            | $ 0             | $ 57   | $ 394   |   |   |
| May 2015 Repurchase Program [Member] [Member]                                                                       |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Amount of common stock authorized for repurchase                                                                    |           |           |            |   |    | $ 1,000 |   |
| Stock Repurchased and Retired During Period, Shares                                                                 | 1.6            | 1.8            | 3.5             | 3.0    |    |   |   |
| Repurchase and retirement of common stock                                                                           | $ 127          | $ 126          | $ 256           | $ 201  |    |   |   |
| Repurchase Program, Total [Member]                                                                                  |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Stock Repurchased and Retired During Period, Shares                                                                 | 1.6            | 1.8            | 3.5             | 4.0    |    |   |   |
| Repurchase and retirement of common stock                                                                           | $ 127          | $ 126          | $ 256           | $ 258  |    |   |   |
| Stock-based compensation expense [Member]                                                                           |           |           |            |   |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                  |           |           |            |   |    |   |   |
| Deferred Income Tax Expense (Benefit)                                                                               | $ 9            |           | $ 18            |   |    |   |   |

| 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.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Grants
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| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Outstanding
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| X                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Target percentage of presented shares granted that may potentially vest
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
+ References
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| - Definition
Unrecognized cost of unvested share-based compensation awards.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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| - Definition
Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased and retired during the period.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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