Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	$ (1,050)	$ (1,244)	$ 2,004
Amortization of actuarial loss	(599)	(1,069)	(1,107)
Prior service (credits) costs during period	96	0	0
Amortization of prior service (costs) credits	19	14	23
Other Benefits
Net Periodic Benefit Cost
Service cost	43	43	38
Interest cost	60	53	71
Expected return on plan assets	0	0	0
Amortization of prior service costs (credits)	(27)	(27)	(28)
Recognized actuarial losses	13	16	3
Settlement losses	0	0	0
Curtailment losses (gains)	0	0	(27)
Total net periodic benefit cost	89	85	57
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(514)	(111)	190
Amortization of actuarial loss	(13)	(15)	(4)
Prior service (credits) costs during period	18	0	0
Amortization of prior service (costs) credits	27	27	42
Total changes recognized in other comprehensive income	(482)	(99)	228
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	(393)	(14)	285
U.S. \| Pension Benefits
Net Periodic Benefit Cost
Service cost	432	450	497
Interest cost	318	235	353
Expected return on plan assets	(624)	(596)	(650)
Amortization of prior service costs (credits)	2	2	2
Recognized actuarial losses	218	309	385
Settlement losses	363	672	620
Curtailment losses (gains)	0	0	92
Total net periodic benefit cost	709	1,072	1,299
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(279)	(725)	1,584
Amortization of actuarial loss	(581)	(981)	(1,005)
Prior service (credits) costs during period	40	0	0
Amortization of prior service (costs) credits	(2)	(2)	(2)
Total changes recognized in other comprehensive income	(822)	(1,708)	577
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	(113)	(636)	1,876
Int’l. \| Pension Benefits
Net Periodic Benefit Cost
Service cost	83	123	130
Interest cost	137	137	175
Expected return on plan assets	(176)	(171)	(209)
Amortization of prior service costs (credits)	6	8	10
Recognized actuarial losses	15	46	45
Settlement losses	(6)	7	37
Curtailment losses (gains)	(5)	(1)	2
Total net periodic benefit cost	54	149	190
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(257)	(408)	230
Amortization of actuarial loss	(5)	(73)	(98)
Prior service (credits) costs during period	38	0	0
Amortization of prior service (costs) credits	(6)	(11)	(17)
Total changes recognized in other comprehensive income	(230)	(492)	115
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	$ (176)	$ (343)	$ 305

Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation.