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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in accumulated other comprehensive income (loss), net of income taxes      
Beginning of the period $ 31,088    
Other Comprehensive Income (Loss) (481) $ (879) $ (1,192)
End of the period 32,784 31,088  
Accumulated Other Comprehensive Income (Loss):      
Changes in accumulated other comprehensive income (loss), net of income taxes      
Beginning of the period (8,465) (7,586)  
Other comprehensive income (loss) before reclassifications (598) (729)  
(Income) loss amounts reclassified from accumulated other comprehensive income 117 (150)  
Other Comprehensive Income (Loss) (481) (879) (1,192)
End of the period (8,946) (8,465) (7,586)
Cumulative Foreign Currency Translation Adjustments      
Changes in accumulated other comprehensive income (loss), net of income taxes      
Beginning of the period (4,924) (4,912)  
Other comprehensive income (loss) before reclassifications 65 (12)  
Other Comprehensive Income (Loss) 65 (12)  
End of the period (4,859) (4,924) (4,912)
Net Actuarial (Losses) and Prior Service (Costs) and Credits      
Changes in accumulated other comprehensive income (loss), net of income taxes      
Beginning of the period (3,540) (2,726)  
Other comprehensive income (loss) before reclassifications (523) (719)  
(Income) loss amounts reclassified from accumulated other comprehensive income 192 (95)  
Other Comprehensive Income (Loss) (331) (814)  
End of the period (3,871) (3,540) (2,726)
Cumulative Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges      
Changes in accumulated other comprehensive income (loss), net of income taxes      
Beginning of the period (1) 52  
Other comprehensive income (loss) before reclassifications (140) 2  
(Income) loss amounts reclassified from accumulated other comprehensive income (75) (55)  
Other Comprehensive Income (Loss) (215) (53)  
End of the period $ (216) $ (1) $ 52