Employee Benefit Plans (Changes in Projected Benefit Obligations, Plan Assets and Funded Status) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 1,974
End balance	1,729	$ 1,974
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(96)	(77)
Other postretirement benefits	(450)	(476)
Accrued pensions	(588)	(566)
Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	2,386	3,534
Service cost	7	9	$ 9
Interest cost	111	73	65
Actuarial losses/(gains)	119	(934)
Benefits paid	(129)	(140)
Foreign currency translation adjustments	47	(126)
Settlements	(320)	(22)
Other	(5)	(8)
Projected benefit obligation, End of year	2,216	2,386	3,534
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,974	2,975
Actual return on plan assets	88	(734)
Company contributions	46	11
Benefits paid	(101)	(114)
Plan settlements	(320)	(22)
Foreign currency translation adjustments	45	(140)
Other	(3)	(2)
End balance	1,729	1,974	2,975
Funded Status	(487)	(412)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	152	183
Accounts payable and accrued liabilities	(51)	(29)
Accrued pensions	(588)	(566)
Net liability recognized	(487)	(412)
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	524	724
Service cost	4	8	12
Interest cost	27	16	14
Plan amendments	(17)	0
Actuarial losses/(gains)	0	(174)
Benefits paid	(42)	(44)
Foreign currency translation adjustments	1	(6)
Curtailments	(2)	0
Projected benefit obligation, End of year	495	524	724
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(45)	(48)
Other postretirement benefits	(450)	(476)
Net liability recognized	(495)	(524)
United States
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Company contributions	28	0	0
United States | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	1,425	1,920
Service cost	0	0
Interest cost	62	45
Actuarial losses/(gains)	44	(449)
Benefits paid	(79)	(91)
Foreign currency translation adjustments	0	0
Settlements	(309)	0
Other	0	0
Projected benefit obligation, End of year	1,143	1,425	1,920
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,028	1,329
Actual return on plan assets	45	(228)
Company contributions	28	0
Benefits paid	(61)	(73)
Plan settlements	(309)	0
Foreign currency translation adjustments	0	0
Other	0	0
End balance	731	1,028	1,329
Funded Status	(412)	(397)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	0	0
Accounts payable and accrued liabilities	(38)	(17)
Accrued pensions	(374)	(380)
Net liability recognized	(412)	(397)
United States | Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	458	631
Service cost	4	8
Interest cost	23	13
Plan amendments	(17)	0
Actuarial losses/(gains)	(3)	(154)
Benefits paid	(39)	(40)
Foreign currency translation adjustments	0	0
Curtailments	(2)	0
Projected benefit obligation, End of year	424	458	631
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(41)	(44)
Other postretirement benefits	(383)	(414)
Net liability recognized	(424)	(458)
International
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Company contributions	18	11	10
International | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	961	1,614
Service cost	7	9
Interest cost	49	28
Actuarial losses/(gains)	75	(485)
Benefits paid	(50)	(49)
Foreign currency translation adjustments	47	(126)
Settlements	(11)	(22)
Other	(5)	(8)
Projected benefit obligation, End of year	1,073	961	1,614
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	946	1,646
Actual return on plan assets	43	(506)
Company contributions	18	11
Benefits paid	(40)	(41)
Plan settlements	(11)	(22)
Foreign currency translation adjustments	45	(140)
Other	(3)	(2)
End balance	998	946	1,646
Funded Status	(75)	(15)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	152	183
Accounts payable and accrued liabilities	(13)	(12)
Accrued pensions	(214)	(186)
Net liability recognized	(75)	(15)
International | Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	66	93
Service cost	0	0
Interest cost	4	3
Plan amendments	0	0
Actuarial losses/(gains)	3	(20)
Benefits paid	(3)	(4)
Foreign currency translation adjustments	1	(6)
Curtailments	0	0
Projected benefit obligation, End of year	71	66	$ 93
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(4)	(4)
Other postretirement benefits	(67)	(62)
Net liability recognized	$ (71)	$ (66)