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Condensed Consolidated Statements Of Equity - USD ($)
$ in Millions
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Noncontrolling Interests [Member]
Noncontrolling Interests [Member]
Preferred Stock [Member]
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 4,280       4,268   12  
Other comprehensive loss (39)         (39) 0  
Purchase of common stock (1,496)     (760) (736)      
Exercise of common stock warrants 4     4        
Stock based compensation 85     101 (16)      
Cash dividends paid on common stock (1,137)       (1,137)      
Dividends to noncontrolling interests (8)           (8)  
Other (39)     0     (39)  
Balance at end of period at Jun. 30, 2017 45,725   15 26,328 28,547 (9,369) 204  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 1,663              
Other comprehensive loss (118)              
Cash dividends paid on common stock (564)              
Balance at end of period at Jun. 30, 2017 45,725   15 26,328 28,547 (9,369) 204  
Balance at beginning of period at Dec. 31, 2017 36,200   14 25,371 17,627 (8,011) 1,199  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Adoption of accounting standards (Note 1) (1,144)       (1,046) (98)    
Net income 3,406       3,436   (30)  
Other comprehensive loss (67)         (62) (5)  
Issuance of preferred stock (Note 17)   $ 1,261           $ 1,261
Purchase of common stock (100)     (44) (56)      
Exercise of common stock warrants 2     2        
Cash dividends paid on common stock (1,071)       (1,071)      
Dividends to noncontrolling interests (37)           (37)  
Other 186     136 (17)   67  
Balance at end of period at Jun. 30, 2018 38,636   14 25,465 18,873 (8,171) 2,455  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 2,366              
Other comprehensive loss (94)              
Cash dividends paid on common stock (536)              
Balance at end of period at Jun. 30, 2018 $ 38,636   $ 14 $ 25,465 $ 18,873 $ (8,171) $ 2,455