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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net actuarial gain (loss) arising during the period	$ (623)	$ 357	$ (210)
Amortization of actuarial loss included in income (loss)	72	178	117
Prior service credit (cost) arising during the period	(10)	0	29
Amortization of prior service (credit) included in income (loss)	(39)	(38)	$ (32)
Pension Benefits | United States
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net actuarial gain (loss) arising during the period	(44)	134
Amortization of actuarial loss included in income (loss)	61	145
Net change during the period	17	279
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	(606)	207
Amortization of actuarial loss included in income (loss)	11	33
Net change during the period	(595)	240
Prior service credit (cost) arising during the period	(1)	0
Amortization of prior service (credit) included in income (loss)	(1)	(1)
Net change during the period	(2)	(1)
Other Benefits
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net actuarial gain (loss) arising during the period	27	16
Amortization of actuarial loss included in income (loss)	0	0
Net change during the period	27	16
Prior service credit (cost) arising during the period	(9)	0
Amortization of prior service (credit) included in income (loss)	(38)	(37)
Net change during the period	$ (47)	$ (37)

X

- Definition

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, 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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