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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 (loss) 1,298       1,287   11  
Other comprehensive income (loss) 1,545         1,547 (2)  
Issuance of preferred stock (Note 17)   $ 985           $ 985
Purchase of common stock (2,994)   (1) (1,476) (1,517)      
Exercise of common stock warrants 42     42        
Stock based compensation 268     293 (25)      
Cash dividends paid on common stock (1,683)       (1,683)      
Dividends to noncontrolling interests (18)           (18)  
Other (41)     (60)     19  
Balance at end of period at Sep. 30, 2017 43,477   14 25,782 24,230 (7,783) 1,234  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) (2,982)              
Other comprehensive income (loss) 1,584              
Cash dividends paid on common stock (546)              
Balance at end of period at Sep. 30, 2017 43,477   14 25,782 24,230 (7,783) 1,234  
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 (loss) 5,936       5,970   (34)  
Other comprehensive income (loss) (217)         (212) (5)  
Issuance of preferred stock (Note 17)   $ 1,753           $ 1,753
Purchase of common stock (100)     (44) (56)      
Exercise of common stock warrants 2     2        
Cash dividends paid on common stock (1,608)       (1,608)      
Dividends to noncontrolling interests (106)           (106)  
Other 192     174 (22)   40  
Balance at end of period at Sep. 30, 2018 40,908   14 25,503 20,865 (8,321) 2,847  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 2,530              
Other comprehensive income (loss) (150)              
Cash dividends paid on common stock (537)              
Balance at end of period at Sep. 30, 2018 $ 40,908   $ 14 $ 25,503 $ 20,865 $ (8,321) $ 2,847