Retirement Plans - Change in Benefit Obligation, Fair Value of Plan Assets & Funded Status of Pension Plans & Postretirement Medical Plan (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Change in Fair Value of Plan Assets
Beginning balance	$ 3,043
Ending balance	3,357	$ 3,043
Settlement payment included in Benefit payments	34	23
Changes in Discount Rate Assumptions
Change in Benefit Obligation
Actuarial (gains) loss	178	(387)
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions	(178)	387
Changes In Inflation Assumptions
Change in Benefit Obligation
Actuarial (gains) loss	(36)	(24)
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions	36	24
Changes in Mortality Assumptions
Change in Benefit Obligation
Actuarial (gains) loss	(7)	(18)
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions	7	18
All Other Assumptions
Change in Benefit Obligation
Actuarial (gains) loss	(2)	(10)
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions	2	10
Funded Pension Plans
Change in Benefit Obligation
Beginning balance	3,085	2,667
Service cost	41	37
Interest cost	52	68
Actuarial (gains) loss	(126)	385
Benefit payments	(100)	(93)
Plan amendments	2	0
Foreign currency exchange rate changes	(6)	21
Ending balance	2,948	3,085
Change in Fair Value of Plan Assets
Beginning balance	3,043	2,732
Actual return on plan assets	417	378
Employer contributions	6	4
Benefit payments	(100)	(93)
Foreign currency exchange rate changes	(9)	22
Ending balance	3,357	3,043
Funded Status (Plan assets greater (less) than benefit obligations) at December 31,	409	(42)
Unrecognized Net Actuarial (Gains) Losses	501	900
Actuarial gains or losses resulted from changes in assumptions	126	(385)
Accumulated benefit obligation	2,856	2,993
Unfunded Pension Plan
Change in Benefit Obligation
Beginning balance	269	242
Service cost	10	13
Interest cost	3	5
Actuarial (gains) loss	(8)	26
Benefit payments	(26)	(17)
Plan amendments	0	0
Foreign currency exchange rate changes	0	0
Ending balance	248	269
Change in Fair Value of Plan Assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	26	17
Benefit payments	(26)	(17)
Foreign currency exchange rate changes	0	0
Ending balance	0	0
Funded Status (Plan assets greater (less) than benefit obligations) at December 31,	(248)	(269)
Unrecognized Net Actuarial (Gains) Losses	66	86
Actuarial gains or losses resulted from changes in assumptions	8	(26)
Accumulated benefit obligation	208	228
Postretirement Medical Plan
Change in Benefit Obligation
Beginning balance	65	75
Service cost	3	3
Interest cost	1	1
Actuarial (gains) loss	(3)	(8)
Benefit payments	(7)	(6)
Plan amendments	0	0
Foreign currency exchange rate changes	0	0
Ending balance	59	65
Change in Fair Value of Plan Assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	7	6
Benefit payments	(7)	(6)
Foreign currency exchange rate changes	0	0
Ending balance	0	0
Funded Status (Plan assets greater (less) than benefit obligations) at December 31,	(59)	(65)
Unrecognized Net Actuarial (Gains) Losses	(21)	(19)
Actuarial gains or losses resulted from changes in assumptions	$ 3	$ 8

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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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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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 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 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) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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