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Stockholders' Equity and Noncontrolling Interests Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ 36,200 $ 44,075
Other comprehensive income, net of tax 27 79
Balance at end of period 35,458 46,214
Foreign currency translation adjustments [Member]    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (1,606) (2,355)
Other comprehensive income and noncontrolling interests, net of reclassification adjustment, tax and impact of adoption of accounting standards 108 91
Balance at end of period (1,498) (2,264)
Defined benefit plans [Member]    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (6,398) (6,968)
Other comprehensive loss before reclassification adjustment, net of tax and impact of adoption of accounting standards (170) (77)
Reclassification adjustment, net of tax 44 48
Other comprehensive income, net of tax (126) (29)
Balance at end of period $ (6,524) $ (6,997)