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Stockholders' Equity Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 $ 152 $ (213) 114 $ 538
Balance at end of period (7,905)   (7,905)  
Foreign currency translation adjustments attributable to parent [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (1,949) (881) (2,034) (1,064)
Balance at end of period (1,959) (1,023) (1,959) (1,023)
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 (3) 1 16 (8)
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 (3) (149) 68 (127)
Reclassification adjustment, net of tax (4) 6 (9) 176
Other comprehensive income (loss), net of tax (7) (143) 59 49
Defined benefit plans [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (6,121) (6,452) (5,999) (7,006)
Other comprehensive income (loss), before reclassification adjustment, net of tax 133 (147) (15) 341
Reclassification adjustment, net of tax 38 82 64 148
Other comprehensive income (loss), net of tax 171 (65) 49 489
Balance at end of period $ (5,950) $ (6,517) $ (5,950) $ (6,517)