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Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning of the period     $ 35,802  
Other comprehensive income (loss) $ (739) $ (174) (1,071) $ (294)
End of the period 35,675   35,675  
Cumulative Foreign Currency Translation (Loss) Adjustments        
Changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning of the period (6,260) (5,230) (5,839) (4,859)
Other comprehensive income (loss) before reclassifications (1,008) (391) (1,429) (762)
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Other comprehensive income (loss) (1,008) (391) (1,429) (762)
End of the period (7,268) (5,621) (7,268) (5,621)
Net Actuarial (Losses) and Prior Service (Costs) and Credits        
Changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning of the period (2,554) (3,738) (2,670) (3,871)
Other comprehensive income (loss) before reclassifications 15 16 45 26
Amounts reclassified from accumulated other comprehensive income 41 62 127 185
Other comprehensive income (loss) 56 78 172 211
End of the period (2,498) (3,660) (2,498) (3,660)
Cumulative Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges and Other        
Changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning of the period 108 (98) 135 (216)
Other comprehensive income (loss) before reclassifications 278 70 289 138
Amounts reclassified from accumulated other comprehensive income (65) 69 (103) 119
Other comprehensive income (loss) 213 139 186 257
End of the period $ 321 $ 41 $ 321 $ 41