Employee Benefit Plans (Change in Benefit Obligations and Fair Value of Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plans Defined Benefit [Member] \| U.S. [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	$ 2,548	$ 2,319
Service cost	73	85	$ 79
Interest cost	53	66	79
Plan participant contributions	0	0
Plan amendments	0	0
Actuarial (gain) loss	(117)	319
Benefits paid	(654)	(241)
Curtailment	12	0
Recognition of termination benefits	9	0
Foreign currency exchange rate change	0	0
Benefit obligation at December 31	1,924	2,548	2,319
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	1,770	1,591
Actual return on plan assets	97	321
Company contributions	451	99
Plan participant contributions	0	0
Benefits paid	(654)	(241)
Foreign currency exchange rate change	0	0
Fair value of plan assets at December 31	1,664	1,770	1,591
Defined Benefit Plan, Funded Status of Plan	(260)	(778)
Pension Plans Defined Benefit [Member] \| Foreign Pension Plans, Defined Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	4,403	3,880
Service cost	61	54	69
Interest cost	79	85	97
Plan participant contributions	0	1
Plan amendments	0	2
Actuarial (gain) loss	(176)	398
Benefits paid	(162)	(151)
Curtailment	0	2
Recognition of termination benefits	0	3
Foreign currency exchange rate change	(81)	129
Benefit obligation at December 31	4,124	4,403	3,880
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	4,793	4,306
Actual return on plan assets	147	416
Company contributions	119	60
Plan participant contributions	1	1
Benefits paid	(162)	(151)
Foreign currency exchange rate change	(86)	161
Fair value of plan assets at December 31	4,812	4,793	4,306
Defined Benefit Plan, Funded Status of Plan	688	390
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	170	216
Service cost	2	2	1
Interest cost	4	6	8
Plan participant contributions	16	18
Plan amendments	0	(30)
Actuarial (gain) loss	(16)	7
Benefits paid	(40)	(49)
Curtailment	1	0
Recognition of termination benefits	0	0
Foreign currency exchange rate change	0	0
Benefit obligation at December 31	137	170	216
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Company contributions	24	31
Plan participant contributions	16	18
Benefits paid	(40)	(49)
Foreign currency exchange rate change	0	0
Fair value of plan assets at December 31	0	0	$ 0
Defined Benefit Plan, Funded Status of Plan	$ (137)	$ (170)

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 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 increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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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Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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