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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, 2017 $ 36,200 $ 14 $ 25,371 $ 17,627 $ (8,011) $ 1,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of accounting standards (1,144)     (1,046) (98)  
Net income 1,040     1,046   (6)
Other comprehensive income (loss) 27       28 (1)
Purchase of common stock (100) 0 (44) (56)    
Cash dividends paid on common stock (536)     (536)    
Dividends to noncontrolling interests (30)         (30)
Other 1   10 (7)   (2)
Balance at end of period at Mar. 31, 2018 35,458 14 25,337 17,028 (8,081) 1,160
Balance at beginning of period at Dec. 31, 2018 42,777 14 25,563 22,322 (9,039) 3,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 2,145     2,157   (12)
Other comprehensive income (loss) 185       190 (5)
Stock based compensation 89   95 (6)    
Cash dividends paid on common stock (539)     (539)    
Dividends to noncontrolling interests (18)         (18)
Other (1)   3 5   (9)
Balance at end of period at Mar. 31, 2019 $ 44,638 $ 14 $ 25,661 $ 23,939 $ (8,849) $ 3,873