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Stockholders' Equity Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period     $ (8,036)  
Other comprehensive income (loss), net of tax $ (62) $ (489) 52 $ 49
Balance at end of period (7,953)   (7,953)  
Foreign currency translation adjustments attributable to parent [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (1,959) (1,023) (2,034) (1,064)
Balance at end of period (2,029) (1,670) (2,029) (1,670)
Foreign currency translation adjustments attributable to noncontrolling interest [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Other comprehensive income (loss), net of tax 14 (2) 30 (10)
Foreign currency translation adjustments including portion attributable to noncontrolling interest [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Other comprehensive income (loss) before reclassification adjustment, net of tax (82) (637) (14) (764)
Reclassification adjustment, net of tax (2) (8) (11) 168
Other comprehensive income (loss), net of tax (84) (645) (25) (596)
Defined benefit plans [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (5,950) (6,517) (5,999) (7,006)
Other comprehensive income (loss) before reclassification adjustment, net of tax (3) 85 (18) 426
Reclassification adjustment, net of tax 33 69 97 217
Other comprehensive income (loss), net of tax 30 154 79 643
Balance at end of period $ (5,920) $ (6,363) $ (5,920) $ (6,363)