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Stockholders' Equity - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, remaining authorized amount | $ 1,700,000,000 |  |  |
Aggregate reduction in common stock and additional paid-in capital during stock repurchases | 14,500,000 | $ 0 | $ 152,000,000 |
Amount charged to retained earnings during stock repurchases | 255,000,000 | $ 0 | $ 2,122,000,000 |
Common stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount | $ 7,500,000,000 |  |  |
Stock Repurchase Program, increased to authorized amount |  |  |  | $ 2,000,000,000.0

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