Employee Benefit Plans (Changes in Projected Benefit Obligations, Plan Assets and Funded Status) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 3,216
End balance	2,975	$ 3,216
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(87)	(85)
Other postretirement benefits	(672)	(733)
Accrued pensions	(834)	(945)
Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	3,975	3,561
Service cost	9	24	$ 23
Interest cost	65	87	105
Actuarial (gains)/losses - net	(163)	416
Benefits paid	(149)	(193)
Defined Benefit Plan, Benefit Obligation, Business Combination	48	0
Foreign currency translation adjustments	(51)	87
Settlements and curtailments	(198)	(6)
Other	(2)	(1)
Projected benefit obligation, End of year	3,534	3,975	3,561
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	3,216	2,965
Actual return on plan assets	108	342
Company contributions	10	17
Benefits paid	(123)	(164)
Defined Benefit Plan, Plan Assets, Business Combination	3	0
Plan settlements	(198)	(19)
Foreign currency translation adjustments	(38)	78
Other	(3)	(3)
End balance	2,975	3,216	2,965
Funded Status	(559)	(759)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	310	218
Accounts payable and accrued liabilities	(35)	(32)
Accrued pensions	(834)	(945)
Net (liability)/asset recognized	(559)	(759)
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	786	712
Service cost	12	10	8
Interest cost	14	20	26
Plan amendments	0	4
Actuarial (gains)/losses - net	(43)	82
Benefits paid	(45)	(44)
Foreign currency translation adjustments	0	2
Projected benefit obligation, End of year	724	786	712
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(52)	(53)
Other postretirement benefits	(672)	(733)
Net (liability)/asset recognized	(724)	(786)
United States | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	2,042	1,842
Service cost	0	13
Interest cost	39	54
Actuarial (gains)/losses - net	(72)	251
Benefits paid	(89)	(133)
Defined Benefit Plan, Benefit Obligation, Business Combination	0	0
Foreign currency translation adjustments	0	0
Settlements and curtailments	0	13
Other	0	2
Projected benefit obligation, End of year	1,920	2,042	1,842
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,335	1,304
Actual return on plan assets	66	144
Company contributions	0	0
Benefits paid	(72)	(113)
Defined Benefit Plan, Plan Assets, Business Combination	0	0
Plan settlements	0	0
Foreign currency translation adjustments	0	0
Other	0	0
End balance	1,329	1,335	1,304
Funded Status	(591)	(707)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	0	0
Accounts payable and accrued liabilities	(23)	(23)
Accrued pensions	(568)	(684)
Net (liability)/asset recognized	(591)	(707)
United States | Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	682	616
Service cost	11	9
Interest cost	12	17
Plan amendments	0	4
Actuarial (gains)/losses - net	(33)	75
Benefits paid	(41)	(39)
Foreign currency translation adjustments	0	0
Projected benefit obligation, End of year	631	682	616
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(47)	(48)
Other postretirement benefits	(584)	(634)
Net (liability)/asset recognized	(631)	(682)
International
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Company contributions	10	17	13
International | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	1,933	1,719
Service cost	9	11
Interest cost	26	33
Actuarial (gains)/losses - net	(91)	165
Benefits paid	(60)	(60)
Defined Benefit Plan, Benefit Obligation, Business Combination	48	0
Foreign currency translation adjustments	(51)	87
Settlements and curtailments	(198)	(19)
Other	(2)	(3)
Projected benefit obligation, End of year	1,614	1,933	1,719
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,881	1,661
Actual return on plan assets	42	198
Company contributions	10	17
Benefits paid	(51)	(51)
Defined Benefit Plan, Plan Assets, Business Combination	3	0
Plan settlements	(198)	(19)
Foreign currency translation adjustments	(38)	78
Other	(3)	(3)
End balance	1,646	1,881	1,661
Funded Status	32	(52)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	310	218
Accounts payable and accrued liabilities	(12)	(9)
Accrued pensions	(266)	(261)
Net (liability)/asset recognized	32	(52)
International | Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	104	96
Service cost	1	1
Interest cost	2	3
Plan amendments	0	0
Actuarial (gains)/losses - net	(10)	7
Benefits paid	(4)	(5)
Foreign currency translation adjustments	0	2
Projected benefit obligation, End of year	93	104	$ 96
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(5)	(5)
Other postretirement benefits	(88)	(99)
Net (liability)/asset recognized	$ (93)	$ (104)