Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) arising during the period	$ (78)	$ 110	$ 0
Prior service credit (cost) arising during the period	0	0	0
Total	(78)	110	0
Net loss (gain) amortization included in benefit cost	(51)	(42)	(43)
Prior service (credit) cost amortization included in benefit cost	(43)	(49)	(57)
Settlements and curtailments	0	(1)	(1)
Total	(94)	(92)	(101)
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) arising during the period	35	(69)	(42)
Prior service credit (cost) arising during the period	0	0	0
Total	35	(69)	(42)
Net loss (gain) amortization included in benefit cost	43	0	128
Prior service (credit) cost amortization included in benefit cost	0	(1)	(32)
Settlements and curtailments	0	36	251
Total	43	35	347
International | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) arising during the period	634	(438)	116
Prior service credit (cost) arising during the period	56	(16)	(4)
Total	690	(454)	112
Net loss (gain) amortization included in benefit cost	5	(3)	96
Prior service (credit) cost amortization included in benefit cost	(13)	2	(14)
Settlements and curtailments	(1)	(6)	1
Total	$ (9)	$ (7)	$ 83