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Condensed Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Noncontrolling Interests [Member]
Balance at beginning of period at Dec. 31, 2015 $ 40,323 $ 15 $ 27,607 $ 20,285 $ (8,036) $ 452
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 1,931     1,953   (22)
Other comprehensive income (loss) (38)       (18) (20)
Purchase of common stock (300)   (167) (133)    
Exercise of common stock warrants 7   7      
Stock based compensation 5   15 (10)    
Cash dividends paid on common stock (587)     (587)    
Dividends declared or paid to noncontrolling interests (8)         (8)
Other (8)   1     (9)
Balance at end of period at Mar. 31, 2016 41,325 15 27,463 21,508 (8,054) 393
Balance at beginning of period at Dec. 31, 2016 44,075 15 26,983 26,168 (9,330) 239
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 2,617     2,608   9
Other comprehensive income (loss) 79       80 (1)
Exercise of common stock warrants 4   4      
Stock based compensation 16   24 (8)    
Cash dividends paid on common stock (573)     (573)    
Other (4)   1     (5)
Balance at end of period at Mar. 31, 2017 $ 46,214 $ 15 $ 27,012 $ 28,195 $ (9,250) $ 242