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CONSOLIDATED STATEMENT OF EQUITY - 6 months ended Jun. 30, 2017 - USD ($)
$ in Millions
Total
Common Stock [Member]
Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interests [Member]
Subsidiary Equity Transactions [Member]
Subsidiary Equity Transactions [Member]
Paid-in Capital [Member]
Subsidiary Equity Transactions [Member]
Noncontrolling Interests [Member]
Balance at Dec. 31, 2016 $ 15,497 $ 57 $ 11,875 $ 1,704 $ (1,033) $ (391) $ 3,285      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income (loss) (609)     (733)     124      
Common stock issued [1] 85 0 85   0          
Dividends—common stock (56)     (56)            
Repurchase of common stock (37)       (37)          
Subsidiary equity transactions               $ (27) $ (16) $ (11)
Distributions to noncontrolling interest owners (214)           (214)      
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net 1         1        
Adjustments for pension and other postretirement plans 47         47        
Balance at Jun. 30, 2017 14,656 $ 57 11,941 887 $ (1,070) $ (343) $ 3,184      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Cumulative effect of accounting change $ (31)   $ (3) $ (28)            
[1] Represents share-based compensation expense.