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Stockholders' Equity and Noncontrolling Interests Preferred and Common Stock (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Stockholders' Equity Note [Abstract]      
Preferred stock shares authorized (in shares) 2,000,000,000.0   2,000,000,000.0
Common stock shares authorized (in shares) 5,000,000,000.0   5,000,000,000.0
Common stock shares issued (in shares) 1,400,000,000   1,400,000,000
Common stock shares outstanding (in shares) 1,400,000,000   1,400,000,000
Common shares purchased during period (in shares) 3,000,000 0  
Common shares purchased during period $ 100    
Total dividends paid on common stock $ 536 $ 573