| **Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions**                     | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]** |            |   |   |
| Unrecognized tax benefits at beginning of period                                                                     | $ 312           | $ 291 | $ 282 |
| Decrease in prior year tax positions                                                                                 |            |   | (6) |
| Increase in prior year tax positions                                                                                 | 62              | 34 |   |
| Increase in current year tax positions                                                                               | 18              | 27 | 41 |
| Decrease related to settlements with taxing authorities                                                              | (10)            | (10) | (6) |
| Decrease related to lapse of statute of limitations                                                                  | (16)            | (18) | (9) |
| Decrease due to effects of foreign currency translation                                                              | (15)            | (12) | (11) |
| Unrecognized tax benefits at end of period                                                                           | 351             | 312 | 291 |
| Gross Unrecognized Tax Benefits, Excluding Interest and Penalties                                                    |            |   |   |
| **Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]** |            |   |   |
| Unrecognized tax benefits at beginning of period                                                                     | 260             | 242 | 228 |
| Decrease in prior year tax positions                                                                                 |            |   | (7) |
| Increase in prior year tax positions                                                                                 | 28              | 19 |   |
| Increase in current year tax positions                                                                               | 17              | 26 | 39 |
| Decrease related to settlements with taxing authorities                                                              | (9)             | (8) | (5) |
| Decrease related to lapse of statute of limitations                                                                  | (8)             | (11) | (6) |
| Decrease due to effects of foreign currency translation                                                              | (11)            | (8) | (7) |
| Unrecognized tax benefits at end of period                                                                           | 277             | 260 | 242 |
| Interest and Penalties                                                                                               |            |   |   |
| **Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]** |            |   |   |
| Unrecognized tax benefits at beginning of period                                                                     | 52              | 49 | 54 |
| Increase in prior year tax positions                                                                                 | 34              | 15 | 1 |
| Increase in current year tax positions                                                                               | 1               | 1 | 2 |
| Decrease related to settlements with taxing authorities                                                              | (1)             | (2) | (1) |
| Decrease related to lapse of statute of limitations                                                                  | (8)             | (7) | (3) |
| Decrease due to effects of foreign currency translation                                                              | (4)             | (4) | (4) |
| Unrecognized tax benefits at end of period                                                                           | $ 74            | $ 52 | $ 49 |

| X                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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| - Definition
Amount of unrecognized tax benefits.
+ References
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| - Definition
Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.
+ References
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| - Definition
Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.
+ References
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| - Definition
Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.
+ References
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| - Definition
Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.
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| - Definition
Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.
+ References
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| - Definition
Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.
+ References
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