Employee Benefit Plans - Before-Tax Amounts not Recognized in Net Periodic Benefit Cost and Sources of Change in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net actuarial gain (loss) arising during the period	$ 81	$ 37	$ (623)
Amortization of actuarial loss included in income (loss)	65	82	72
Prior service credit (cost) arising during the period	(57)	0	(10)
Amortization of prior service (credit) included in income (loss)	(38)	(38)	$ (39)
Pension Benefits \| U.S.
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net actuarial gain (loss) arising during the period	3	30
Amortization of actuarial loss included in income (loss)	8	18
Net change during the period	11	48
Prior service credit (cost) arising during the period	0	0
Amortization of prior service (credit) included in income (loss)	0	0
Net change during the period	0	0
Pension Benefits \| Int’l.
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net actuarial gain (loss) arising during the period	83	29
Amortization of actuarial loss included in income (loss)	57	67
Net change during the period	140	96
Prior service credit (cost) arising during the period	(57)	0
Amortization of prior service (credit) included in income (loss)	0	0
Net change during the period	(57)	0
Other Benefits
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net actuarial gain (loss) arising during the period	(5)	(22)
Amortization of actuarial loss included in income (loss)	0	(3)
Net change during the period	(5)	(25)
Prior service credit (cost) arising during the period	0	0
Amortization of prior service (credit) included in income (loss)	(38)	(38)
Net change during the period	$ (38)	$ (38)

Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.

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- Definition

Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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- Definition

Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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