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Stockholders' Equity - Impact to Equity as a Result of Stock Repurchases (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity, Repurchased Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Value | $ 1,749 | $ 2,900 | $ 954
Common Stock Including Additional Paid in Capital [Member] |  |  |
Equity, Repurchased Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Value | 77 | 112 | 34
Retained Earnings [Member] |  |  |
Equity, Repurchased Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Value | $ 1,791 | $ 2,940 | $ 1,028

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