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Stockholders’ Equity - Summary of Stock Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 13, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jan. 31, 2020
Equity [Abstract] |  |  |  |  |  |
Shares Repurchased (in shares) |  |  |  | 42,000,000 |  |
Average Price per Share (in usd per share) |  |  |  | $ 40.59 |  |
Value of Shares Repurchased |  |  |  | $ 1,698 |  |
Shares Repurchased, Remaining Amount Authorized |  |  |  |  |  |
Beginning balance |  |  |  | 2,151 |  |
Authorization of additional plan |  |  |  |  |  | $ 5,000
Repurchase of shares of common stock |  |  |  | (1,698) |  |
Ending balance |  | $ 2,453 |  | $ 2,453 |  |
Treasury shares retired (in shares) |  |  |  | 0 |  |
Treasury stock at cost |  |  |  |  |  |
Equity [Abstract] |  |  |  |  |  |
Value of Shares Repurchased |  | 1,150 | $ 1,000 | $ 4,700 | $ 4,002 |
Shares Repurchased, Remaining Amount Authorized |  |  |  |  |  |
Repurchase of shares of common stock |  | (1,150) | (1,000) | (4,700) | (4,002) |
Additional paid-in capital |  |  |  |  |  |
Equity [Abstract] |  |  |  |  |  |
Value of Shares Repurchased |  | (450) | 0 | 0 | 0 |
Shares Repurchased, Remaining Amount Authorized |  |  |  |  |  |
Repurchase of shares of common stock |  | 450 | $ 0 | $ 0 | $ 0 |
Accelerated Share Repurchased Agreement |  |  |  |  |  |
Equity [Abstract] |  |  |  |  |  |
Shares Repurchased (in shares) | 69,000,000 |  |  |  |  |
Value of Shares Repurchased | $ 3,000 |  |  |  |  |
Shares Repurchased, Remaining Amount Authorized |  |  |  |  |  |
Repurchase of shares of common stock | (3,000) |  |  |  |  |
Accelerated Share Repurchased Agreement | Treasury stock at cost |  |  |  |  |  |
Equity [Abstract] |  |  |  |  |  |
Shares Repurchased (in shares) |  |  |  | 74,000,000 |  |
Average Price per Share (in usd per share) |  |  |  | $ 40.77 |  |
Value of Shares Repurchased | 2,550 | 450 |  | $ 3,000 |  |
Shares Repurchased, Remaining Amount Authorized |  |  |  |  |  |
Repurchase of shares of common stock | $ (2,550) | $ (450) |  | $ (3,000) |  |

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