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Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 13, 2020 | Oct. 28, 2020 | Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  |  |  | $ 5,000,000,000 |
Value of shares repurchased |  |  |  |  |  | $ 1,698,000,000 |  |  |
Shares repurchased (in shares) |  |  |  |  |  | 42 |  |  |
Accelerated share repurchase, average price per share (in usd per share) |  |  | $ 40.77 |  |  |  |  |  |
Number of shares repurchased under the ASR agreement |  |  | 74 |  |  |  |  |  |
Payments for dividends |  |  |  | $ 111,000,000 | $ 115,000,000 | $ 337,000,000 | $ 360,000,000 |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) |  | $ 0.16 |  |  |  |  |  |  |
Treasury stock at cost |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Value of shares repurchased |  |  |  | 1,150,000,000 | 1,000,000,000 | 4,700,000,000 | 4,002,000,000 |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Value of shares repurchased |  |  |  | (450,000,000) | $ 0 | 0 | $ 0 |  |
Stock Repurchase Program January 2019 |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  |  |  |  | $ 4,000,000,000.0
Stock Repurchase Program January 2020 |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  |  |  | $ 5,000,000,000.0 |
Accelerated Share Repurchased Agreement |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Value of shares repurchased | $ 3,000,000,000.0 |  |  |  |  |  |  |  |
Shares repurchased (in shares) | 69 |  |  |  |  |  |  |  |
Accelerated Share Repurchased Agreement | Treasury stock at cost |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Value of shares repurchased | $ 2,550,000,000 |  |  | $ 450,000,000 |  | $ 3,000,000,000 |  |  |
Shares repurchased (in shares) |  |  |  |  |  | 74 |  |  |

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