Employee Benefit Plans - Summary of Change in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
U.S.
Change in Plan Assets
Fair value of plan assets at January 1	$ 9,930
Employer contributions	1,552
Fair value of plan assets at December 31	9,919	$ 9,930
Int’l.
Change in Plan Assets
Fair value of plan assets at January 1	5,363
Employer contributions	199
Fair value of plan assets at December 31	4,950	5,363
Pension Benefits \| U.S.
Change in Benefit Obligation
Benefit obligation at January 1	15,166	14,465
Service cost	450	497	$ 406
Interest cost	235	353	397
Plan participants’ contributions	0	0
Actuarial (gain) loss	(325)	1,782
Foreign currency exchange rate changes	0	0
Benefits paid	(2,560)	(2,045)
Acquisitions	0	22
Curtailment	0	92
Benefit obligation at December 31	12,966	15,166	14,465
Change in Plan Assets
Fair value of plan assets at January 1	9,930	10,177
Actual return on plan assets	997	848
Foreign currency exchange rate changes	0	0
Employer contributions	1,552	950
Plan participants’ contributions	0	0
Benefits paid	(2,560)	(2,045)
Fair value of plan assets at December 31	9,919	9,930	10,177
Funded status at December 31	(3,047)	(5,236)
Pension Benefits \| Int’l.
Change in Benefit Obligation
Benefit obligation at January 1	6,307	5,680
Service cost	123	130	139
Interest cost	137	175	199
Plan participants’ contributions	3	3
Actuarial (gain) loss	(364)	550
Foreign currency exchange rate changes	(85)	158
Benefits paid	(746)	(368)
Acquisitions	0	0
Curtailment	(24)	(21)
Benefit obligation at December 31	5,351	6,307	5,680
Change in Plan Assets
Fair value of plan assets at January 1	5,363	4,791
Actual return on plan assets	166	500
Foreign currency exchange rate changes	(35)	174
Employer contributions	199	263
Plan participants’ contributions	3	3
Benefits paid	(746)	(368)
Fair value of plan assets at December 31	4,950	5,363	4,791
Funded status at December 31	(401)	(944)
Other Benefits
Change in Benefit Obligation
Benefit obligation at January 1	2,650	2,520
Service cost	43	38	36
Interest cost	53	71	96
Plan participants’ contributions	43	59
Actuarial (gain) loss	(108)	191
Foreign currency exchange rate changes	(3)	(1)
Benefits paid	(189)	(214)
Divestitures	0	0
Curtailment	0	(14)
Benefit obligation at December 31	2,489	2,650	2,520
Change in Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions	146	155
Plan participants’ contributions	43	59
Benefits paid	(189)	(214)
Fair value of plan assets at December 31	0	0	$ 0
Funded status at December 31	$ (2,489)	$ (2,650)

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of decrease in benefit obligation of defined benefit plan from disposal or classification as held-for-sale.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increases plan assets.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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