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Pension and Other Benefit Plans - Changes in Projected Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Plan Assets
Benefits paid	$ (257)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(967)	$ (967)	$ (1,153)
US
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year		4,278	4,603
Service cost		49	59	$ 57
Interest cost		180	167	175
Actuarial (gains) losses		535	(349)
Settlement		(240)
Benefits paid		(209)	(202)
Projected benefit obligation at end of year	4,593	4,593	4,278	4,603
Change in Plan Assets
Plan assets at fair value at beginning of year		3,748	4,058
Actual return on plan assets		931	(112)
Company contributions		6	4
Settlement		(240)
Benefits paid		(209)	(202)
Plan assets at fair value at end of year	4,236	4,236	3,748	4,058
Unfunded Liability	(357)	(357)	(530)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(357)	(357)	(530)
Total of post retirement benefits	(357)	(357)	(530)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	622	622	852
Prior service cost	9	9	18
Total amount recognized in accumulated other comprehensive income	631	631	870
Accumulated benefit obligation	4,345	4,345	4,070
International
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year		8,111	8,752
Service cost		112	138	95
Interest cost		333	304	306
Contribution by plan participants		63	79
Actuarial (gains) losses		1,304	(758)
Currency effect		50	(87)
Settlement		(17)
Benefits paid		(309)	(317)
Projected benefit obligation at end of year	9,647	9,647	8,111	8,752
Change in Plan Assets
Plan assets at fair value at beginning of year		7,872	8,507
Actual return on plan assets		1,676	(370)
Currency effect		59	(105)
Company contributions		19	78
Contributions by plan participants		63	79
Settlement		(17)
Benefits paid		(309)	(317)
Plan assets at fair value at end of year	9,363	9,363	7,872	$ 8,507
Unfunded Liability	(284)	(284)	(239)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(602)	(602)	(514)
Other Assets	318	318	275
Total of post retirement benefits	(284)	(284)	(239)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	1,638	1,638	1,440
Prior service cost			9
Total amount recognized in accumulated other comprehensive income	1,638	1,638	1,449
Accumulated benefit obligation	$ 9,376	$ 9,376	$ 7,895

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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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- Definition

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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- Definition

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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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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