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Common Stockholders' Equity and Preferred Securities (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2019
Equity [Abstract] |  |  |  |
Number of shares repurchased (in shares) | 19,200,000 |  |  |
Repurchases of common stock | $ 1,641,000,000 | $ 1,250,000,000 | $ 1,844,000,000 |
Authorized amount under share repurchase program |  |  | $ 3,000,000,000.0 | $ 3,000,000,000.0
Amount remaining under repurchase programs | $ 3,100,000,000 |  |  |
Common stock reserved for future issuance (in shares) | 8,000,000 |  |  |
Junior preferred stock outstanding (in shares) | 2 |  |  |
Junior preferred stock par value per share (in dollars per share) | $ 0.01 |  |  |
Preferred stock authorized to issue (in shares) | 250,000,000 |  |  |

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