Supplemental Equity and Comprehensive Income (Loss) Information - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Amount Reclassified from Accumulated Other Comprehensive Income
Provision (benefit) for income taxes	$ 203	$ (2,261)	$ 423	$ (2,116)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Cumulative Translation Adjustment
Amount Reclassified from Accumulated Other Comprehensive Income
Provision (benefit) for income taxes	0	0	0	0
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Pension and Postretirement Plans Adjustment
Amount Reclassified from Accumulated Other Comprehensive Income
Provision (benefit) for income taxes	(216)	(15)	(229)	(28)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Cash Flow Hedging Instruments, Unrealized Gain (Loss)
Amount Reclassified from Accumulated Other Comprehensive Income
Provision (benefit) for income taxes	$ 7	$ 8	$ 13	$ 18