Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period			$ 35,802
Other comprehensive income (loss)	$ (232)	$ 219	(332)	$ (120)
End of the period	36,490		36,490
Cumulative Foreign Currency Translation (Loss) Adjustments
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period	(5,945)	(5,395)	(5,839)	(4,859)
Other comprehensive income (loss) before reclassifications	(315)	165	(421)	(371)
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive income (loss)	(315)	165	(421)	(371)
End of the period	(6,260)	(5,230)	(6,260)	(5,230)
Net Actuarial (Losses) and Prior Service (Costs) and Credits
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period	(2,608)	(3,786)	(2,670)	(3,871)
Other comprehensive income (loss) before reclassifications	13	(12)	30	10
Amounts reclassified from accumulated other comprehensive income	41	60	86	123
Other comprehensive income (loss)	54	48	116	133
End of the period	(2,554)	(3,738)	(2,554)	(3,738)
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	79	(104)	135	(216)
Other comprehensive income (loss) before reclassifications	45	(28)	11	68
Amounts reclassified from accumulated other comprehensive income	(16)	34	(38)	50
Other comprehensive income (loss)	29	6	(27)	118
End of the period	$ 108	$ (98)	$ 108	$ (98)