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Stockholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | $ 20,501 |  |
Reclassifications to retained earnings as a result of the adoption of new accounting standards |  |  |  |  | $ 190
Net current period other comprehensive income (loss) | $ 172 | $ (140) | 130 | $ (158) |
Balance at June 30, 2018 | 21,734 |  | 21,734 |  |
Foreign Currency Translation |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | 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) |  |  | (18) |  |
Reclassifications to net income |  |  | 0 |  |
Net current period other comprehensive income (loss) |  |  | (18) |  |
Balance at June 30, 2018 | 67 |  | 67 |  |
Unrealized Gains and Losses on Available-for-Sale Securities |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | 194 |  |
Reclassifications to retained earnings as a result of the adoption of new accounting standards |  |  |  |  | (293)
Balance at January 1, 2018 |  |  |  |  | (99)
Net unrealized gain (loss) |  |  | (6) |  |
Reclassifications to net income |  |  | 4 |  |
Net current period other comprehensive income (loss) |  |  | (2) |  |
Balance at June 30, 2018 | (101) |  | (101) |  |
Unrealized Gains and Losses on Cash Flow Hedges |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | (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) |  |  | 57 |  |
Reclassifications to net income |  |  | 93 |  |
Net current period other comprehensive income (loss) |  |  | 150 |  |
Balance at June 30, 2018 | 36 |  | 36 |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | 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) |  |  | 33 |  |
Reclassifications to net income |  |  | 97 |  |
Net current period other comprehensive income (loss) |  |  | 130 |  |
Balance at June 30, 2018 | $ 2 |  | $ 2 |  |

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