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Stockholders' Equity Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | $ 22,751 | $ 21,734 | $ 21,534 | $ 20,501 |
Net current period other comprehensive income (loss) | 15 | 34 | 37 | 164 |
Ending Balance | 20,736 | 23,007 | 20,736 | 23,007 |
Foreign Currency Translation |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 47 | 85 |
Reclassifications to retained earnings as a result of the adoption of new accounting standards |  |  |  |  | $ 0
Balance at January 1, 2018 |  |  |  |  | 85
Net unrealized gain (loss) |  |  | (19) | (17) |
Reclassifications to net income |  |  | 0 | 0 |
Net current period other comprehensive income (loss) |  |  | (19) | (17) |
Ending Balance | 28 | 68 | 28 | 68 |
Unrealized Gains and Losses on Available-for-Sale Securities |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | (52) | 194 |
Balance at January 1, 2018 |  |  |  |  | (99)
Net unrealized gain (loss) |  |  | 53 | 25 |
Reclassifications to net income |  |  | 0 | 4 |
Net current period other comprehensive income (loss) |  |  | 53 | 29 |
Ending Balance | 1 | (70) | 1 | (70) |
Unrealized Gains and Losses on Cash Flow Hedges |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 85 | (114) |
Reclassifications to retained earnings as a result of the adoption of new accounting standards |  |  |  |  | 0
Balance at January 1, 2018 |  |  |  |  | (114)
Net unrealized gain (loss) |  |  | 99 | 51 |
Reclassifications to net income |  |  | (96) | 101 |
Net current period other comprehensive income (loss) |  |  | 3 | 152 |
Ending Balance | 88 | 38 | 88 | 38 |
AOCI Attributable to Parent |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | 102 | 2 | 80 | 165 |
Reclassifications to retained earnings as a result of the adoption of new accounting standards |  |  |  |  | (293)
Balance at January 1, 2018 |  |  |  |  | $ (128)
Net unrealized gain (loss) |  |  | 133 | 59 |
Reclassifications to net income |  |  | (96) | 105 |
Net current period other comprehensive income (loss) | 15 | 34 | 37 | 164 |
Ending Balance | $ 117 | $ 36 | $ 117 | $ 36 |

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