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Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized share-based compensation expense | $ 825 | $ 639 | $ 586
Restricted share units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized share-based compensation expense | 564 | 402 | 349
Stock options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized share-based compensation expense | 231 | 205 | 205
Employee stock purchase plans [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized share-based compensation expense | $ 30 | $ 32 | $ 32

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