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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