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Stockholders' Equity Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ 44,075 $ 40,323
Other comprehensive income (loss), net of tax 79 (38)
Balance at end of period 46,214 41,325
Foreign currency translation adjustments [Member]    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (2,355) (2,034)
Other comprehensive income net of reclassification adjustment, noncontrolling interests and tax 91 85
Balance at end of period (2,264) (1,949)
Defined benefit plans [Member]    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (6,968) (5,999)
Other comprehensive income (loss) before reclassification adjustment, net of tax (77) (148)
Reclassification adjustment, net of tax 48 26
Other comprehensive income (loss), net of tax (29) (122)
Balance at end of period $ (6,997) $ (6,121)