Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of the period	$ 36,686
Other Comprehensive Income (Loss)	212	$ 323	$ 572
End of the period	38,603	36,686
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of the period	(8,051)	(8,374)
Other comprehensive income (loss) before reclassifications	344	312
(Income) loss amounts reclassified from accumulated other comprehensive income	(132)	11
Other Comprehensive Income (Loss)	212	323	572
End of the period	(7,839)	(8,051)	(8,374)
Cumulative Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of the period	(6,733)	(5,839)
Other comprehensive income (loss) before reclassifications	212	(894)
(Income) loss amounts reclassified from accumulated other comprehensive income	17	0
Other Comprehensive Income (Loss)	229	(894)
End of the period	(6,504)	(6,733)	(5,839)
Net Actuarial Gains (Losses) and Prior Service (Costs) and Credits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of the period	(1,493)	(2,670)
Other comprehensive income (loss) before reclassifications	127	1,007
(Income) loss amounts reclassified from accumulated other comprehensive income	(10)	170
Other Comprehensive Income (Loss)	117	1,177
End of the period	(1,376)	(1,493)	(2,670)
Cumulative Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of the period	175	135
Other comprehensive income (loss) before reclassifications	5	199
(Income) loss amounts reclassified from accumulated other comprehensive income	(139)	(159)
Other Comprehensive Income (Loss)	(134)	40
End of the period	$ 41	$ 175	$ 135