| **Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions**                      | 3 Months Ended         |        |         |
|-------------------------------------------------------------------------------------------------|------------------------|--------|---------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |                   |   |    |   |
| Measurement periods for performance based restricted stock                                      | 3 years                |   |    |   |
| Measurement periods for common stock, absolute TSR                                              | 3 years                |   |    |   |
| Unrecognized compensation cost related to stock options and restricted stock rights             | $ 1,191                |   |    |   |
| Amount of common stock authorized for repurchase                                                |                   |   | $ 5,000 | $ 2,600 |
| Restricted Stock Units (RSUs)                                                                   |                   |   |    |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |                   |   |    |   |
| Share-based compensation arrangement by share-based payment award, award vesting period         | 3 years                |   |    |   |
| Unrecognized compensation cost related to stock options and restricted stock rights             | $ 1,094                |   |    |   |
| Weighted-average service period                                                                 | 2 years 1 month 6 days |   |    |   |
| Market-Based Restricted Stock Units                                                             |                   |   |    |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |                   |   |    |   |
| Unrecognized compensation cost related to stock options and restricted stock rights             | $ 26                   |   |    |   |
| Market-Based Restricted Stock Units | 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%                  |   |    |   |
| Percentage range of shares received at vesting based on absolute total stock return measurement | 0.00%                  |   |    |   |
| Market-Based Restricted Stock Units | 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%                |   |    |   |
| Percentage range of shares received at vesting based on absolute total stock return measurement | 75.00%                 |   |    |   |
| Performance Based Restricted Stock Units                                                        |                   |   |    |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |                   |   |    |   |
| Unrecognized compensation cost related to stock options and restricted stock rights             | $ 71                   |   |    |   |
| Performance Based Restricted Stock Units | 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%                  |   |    |   |
| Performance Based Restricted Stock Units | 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%                |   |    |   |
| Stock-based compensation expense                                                                |                   |   |    |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |                   |   |    |   |
| Deferred income tax expense (benefit)                                                           | $ 20                   | $ 29   |    |   |

| X                                                                                                                                                                                                                                                                            |
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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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| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.
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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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Amount of stock repurchase plan authorized.
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