Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	$ (1,244)	$ 2,004	$ 2,404
Amortization of actuarial loss	(1,069)	(1,107)	(519)
Prior service (credits) costs during period	0	0	28
Amortization of prior service (costs) credits	14	23	(4)
Other Benefits
Net Periodic Benefit Cost
Service cost	43	38	36
Interest cost	53	71	96
Expected return on plan assets	0	0	0
Amortization of prior service costs (credits)	(27)	(28)	(28)
Recognized actuarial losses	16	3	(3)
Settlement losses	0	0	0
Curtailment losses (gains)	0	(27)	0
Total net periodic benefit cost	85	57	101
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(111)	190	128
Amortization of actuarial loss	(15)	(4)	3
Prior service (credits) costs during period	0	0	(1)
Amortization of prior service (costs) credits	27	42	28
Total changes recognized in other comprehensive income	(99)	228	158
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	(14)	285	259
U.S. \| Pension Benefits
Net Periodic Benefit Cost
Service cost	450	497	406
Interest cost	235	353	397
Expected return on plan assets	(596)	(650)	(565)
Amortization of prior service costs (credits)	2	2	2
Recognized actuarial losses	309	385	239
Settlement losses	672	620	259
Curtailment losses (gains)	0	92	0
Total net periodic benefit cost	1,072	1,299	738
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(725)	1,584	1,939
Amortization of actuarial loss	(981)	(1,005)	(498)
Prior service (credits) costs during period	0	0	0
Amortization of prior service (costs) credits	(2)	(2)	(2)
Total changes recognized in other comprehensive income	(1,708)	577	1,439
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	(636)	1,876	2,177
Int’l. \| Pension Benefits
Net Periodic Benefit Cost
Service cost	123	130	139
Interest cost	137	175	199
Expected return on plan assets	(171)	(209)	(231)
Amortization of prior service costs (credits)	8	10	11
Recognized actuarial losses	46	45	21
Settlement losses	7	37	3
Curtailment losses (gains)	(1)	2	16
Total net periodic benefit cost	149	190	158
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(408)	230	338
Amortization of actuarial loss	(73)	(98)	(24)
Prior service (credits) costs during period	0	0	29
Amortization of prior service (costs) credits	(11)	(17)	(30)
Total changes recognized in other comprehensive income	(492)	115	313
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	$ (343)	$ 305	$ 471

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 ten percent of greater of fair value of plan assets or benefit obligation.