| **Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions** | 12 Months Ended |
|-------------------------------------------------------------------------------------|-----------------|
||
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                      |            |   |   |
| Balance at beginning of year                                                        | $ (1,068)       | $ (762) | $ (551) |
| Gains (losses) on foreign currency translation                                      | 55              | (276) | (169) |
| Less: Tax provision/(benefit)                                                       | (17)            | 30 | 42 |
| Net gains (losses) on foreign currency translation                                  | 72              | (306) | (211) |
| Other comprehensive income (loss), net of tax                                       | 72              | (306) | (211) |
| Balance at end of year                                                              | (996)           | (1,068) | (762) |
| Balance at beginning of year                                                        | 21              | (12) | (44) |
| Gains (losses) deferred                                                             | (13)            | 421 | 209 |
| Less: Tax provision/(benefit)                                                       | (3)             | 97 | 24 |
| Net gains (losses) deferred                                                         | (10)            | 324 | 185 |
| (Gains) losses reclassified to earnings                                             | 10              | (384) | (166) |
| Less: Tax (provision)/benefit                                                       | 3               | (93) | (13) |
| Net (gains) losses reclassified to earnings                                         | 7               | (291) | (153) |
| Other comprehensive income (loss), net of tax                                       | (3)             | 33 | 32 |
| Balance at end of year                                                              | 18              | 21 | (12) |
| Total Accumulated other comprehensive income (loss) at end of year                  | $ (978)         | $ (1,047) | $ (774) |

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.
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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, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.
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Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.
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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.
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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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