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Stockholders' Equity and Noncontrolling Interests Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period $ (8,036)    
Other comprehensive income (loss), net of tax (1,353) $ 56 $ (4,983)
Balance at end of period (9,330) (8,036)  
Foreign currency translation adjustments attributable to parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period (2,034) (1,064) (614)
Balance at end of period (2,355) (2,034) (1,064)
Foreign currency translation adjustments including portion attributable to noncontrolling interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassification adjustment, net of tax (375) (1,153) (475)
Reclassification adjustment, net of tax (4) 198 2
Other comprehensive income (loss), net of tax (379) (955) (473)
Foreign currency translation adjustments attributable to noncontrolling interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), net of tax 58 (15) 23
Defined benefit plans attributable to parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period (5,999) (7,006) (2,501)
Balance at end of period (6,968) (5,999) (7,006)
Defined benefit plans including portion attributable to noncontrolling interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassification adjustment (1,546) 817 (6,477)
Tax expense (benefit) (459) 41 (1,854)
Other comprehensive income (loss) before reclassification adjustment, net of tax (1,087) 776 (4,623)
Reclassification adjustment, net of tax 118 235 118
Other comprehensive income (loss), net of tax (969) 1,011 (4,505)
Defined benefit plans attributable to noncontrolling interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), net of tax $ 0 $ (4) $ 0