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Stockholders' Equity and Noncontrolling Interests Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period $ 42,777 $ 36,200
Other comprehensive income, net of tax 185 27
Balance at end of period 44,638 35,458
Foreign currency translation adjustments [Member]    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (2,250) (1,606)
Other comprehensive income (loss) and noncontrolling interests, net of reclassification adjustment, tax and impact of adoption of accounting standards 125 108
Balance at end of period (2,125) (1,498)
Defined benefit plans [Member]    
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]    
Balance at beginning of period (6,737) (6,398)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards (1) (170)
Reclassification adjustment, net of tax 37 44
Other comprehensive income, net of tax 36 (126)
Balance at end of period $ (6,701) $ (6,524)