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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period $ 47,089 $ 44,638 $ 42,777 $ 38,636 $ 35,458 $ 36,200 $ 42,777 $ 36,200
Other comprehensive income (loss), net of tax (237) 74 185 (150) (94) 27 22 (217)
Balance at end of period 48,771 47,089 44,638 40,908 38,636 35,458 48,771 40,908
Foreign currency translation adjustments [Member]                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (2,078)   (2,250) (1,826)   (1,606) (2,250) (1,606)
Other comprehensive income (loss) and noncontrolling interests, net of reclassification adjustment, tax and impact of adoption of accounting standards (341)     (215)     (169) (435)
Balance at end of period (2,419) (2,078)   (2,041) (1,826)   (2,419) (2,041)
Defined benefit plans [Member]                
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]                
Balance at beginning of period (6,695)   $ (6,737) (6,290)   $ (6,398) (6,737) (6,398)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards 80     (4)     51 16
Reclassification adjustment, net of tax 40     63     111 151
Other comprehensive income (loss), net of tax 120     59     162 167
Balance at end of period $ (6,575) $ (6,695)   $ (6,231) $ (6,290)   $ (6,575) $ (6,231)