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, 2022	Dec. 31, 2021
Change in Fair Value of Plan Assets
Beginning balance	$ 3,357
Ending balance	2,450	$ 3,357
Changes in Discount Rate Assumptions
Change in Benefit Obligation
Actuarial (gains) loss	874	178
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions	(874)	(178)
Changes in Mortality Assumptions
Change in Benefit Obligation
Actuarial (gains) loss	(8)	(7)
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions	8	7
Changes In Inflation Assumptions \| UK Pension Plan
Change in Benefit Obligation
Actuarial (gains) loss		(36)
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions		36
All Other Assumptions
Change in Benefit Obligation
Actuarial (gains) loss	(3)	(34)
Change in Fair Value of Plan Assets
Actuarial gains or losses resulted from changes in assumptions	3	34
Funded Pension Plans
Change in Benefit Obligation
Beginning balance	2,948	3,085
Service cost	33	41
Interest cost	66	52
Actuarial (gains) loss	(818)	(126)
Plan settlements	266	10
Benefit payments	(90)	(90)
Plan amendments	0	2
Foreign currency exchange rate changes	(71)	(6)
Ending balance	1,802	2,948
Change in Fair Value of Plan Assets
Beginning balance	3,357	3,043
Actual return on plan assets	(469)	417
Employer contributions	1	6
Plan settlements	266	10
Benefit payments	(90)	(90)
Foreign currency exchange rate changes	(83)	(9)
Ending balance	2,450	3,357
Funded Status (Plan assets greater (less) than benefit obligations) at December 31,	648	409
Unrecognized Net Actuarial (Gains) Losses	337	501
Actuarial gains or losses resulted from changes in assumptions	818	126
Accumulated benefit obligation	1,743	2,856
Unfunded Pension Plan
Change in Benefit Obligation
Beginning balance	248	269
Service cost	11	10
Interest cost	3	3
Actuarial (gains) loss	(38)	(8)
Plan settlements	0	24
Benefit payments	(12)	(2)
Plan amendments	0	0
Foreign currency exchange rate changes	0	0
Ending balance	212	248
Change in Fair Value of Plan Assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	12	26
Plan settlements	0	24
Benefit payments	(12)	(2)
Foreign currency exchange rate changes	0	0
Ending balance	0	0
Funded Status (Plan assets greater (less) than benefit obligations) at December 31,	(212)	(248)
Unrecognized Net Actuarial (Gains) Losses	23	66
Actuarial gains or losses resulted from changes in assumptions	38	8
Accumulated benefit obligation	180	208
Postretirement Medical Plan
Change in Benefit Obligation
Beginning balance	59	65
Service cost	3	3
Interest cost	1	1
Actuarial (gains) loss	(7)	(3)
Plan settlements	0	0
Benefit payments	(4)	(7)
Plan amendments	0	0
Foreign currency exchange rate changes	0	0
Ending balance	52	59
Change in Fair Value of Plan Assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	4	7
Plan settlements	0	0
Benefit payments	(4)	(7)
Foreign currency exchange rate changes	0	0
Ending balance	0	0
Funded Status (Plan assets greater (less) than benefit obligations) at December 31,	(52)	(59)
Unrecognized Net Actuarial (Gains) Losses	(27)	(21)
Actuarial gains or losses resulted from changes in assumptions	$ 7	$ 3

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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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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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 payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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