Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Postretirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	$ 1,045	$ 947
Actual return on plan assets	35	115
Company contributions	46	74
Effects of exchange rate changes	0	0
Benefits paid	(89)	(95)
Settlements	0	(2)
Other	3	6
Fair value of plan assets December 31	1,040	1,045	$ 947
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation January 1	1,104	1,157
Service cost	30	32	48
Interest cost	56	63	46
Actuarial (gains) losses	32	(58)
Benefits paid	(89)	(95)
Effects of exchange rate changes	(4)	1
Plan amendments	0	0
Curtailments	0	0
Termination benefits	4	0	0
Settlements	0	(2)
Other	3	6
Benefit obligation December 31	1,136	1,104	1,157
Funded status December 31	(96)	(59)
Recognized as:
Other Assets	51	107
Accrued and other current liabilities	(7)	(8)
Other Noncurrent Liabilities	(140)	(158)
United States | Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	9,804	9,094
Actual return on plan assets	266	1,077
Company contributions	262	307
Effects of exchange rate changes	0	0
Benefits paid	(615)	(497)
Settlements	0	(177)
Other	0	0
Fair value of plan assets December 31	9,717	9,804	9,094
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation January 1	10,446	9,854
Service cost	373	326	372
Interest cost	537	526	457
Actuarial (gains) losses	(595)	403
Benefits paid	(615)	(497)
Effects of exchange rate changes	0	0
Plan amendments	0	0
Curtailments	0	8
Termination benefits	5	3	2
Settlements	0	(177)
Other	0	0
Benefit obligation December 31	10,151	10,446	9,854
Funded status December 31	(434)	(642)
Recognized as:
Other Assets	26	0
Accrued and other current liabilities	(55)	(49)
Other Noncurrent Liabilities	(405)	(593)
International | Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets January 1	9,562	8,473
Actual return on plan assets	637	832
Company contributions	198	249
Effects of exchange rate changes	(522)	283
Benefits paid	(250)	(256)
Settlements	(14)	(53)
Other	36	34
Fair value of plan assets December 31	9,647	9,562	8,473
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation January 1	9,042	7,755
Service cost	243	196	283
Interest cost	294	299	145
Actuarial (gains) losses	(549)	766
Benefits paid	(250)	(256)
Effects of exchange rate changes	(473)	288
Plan amendments	(56)	14
Curtailments	0	(1)
Termination benefits	1	0	1
Settlements	(14)	(53)
Other	36	34
Benefit obligation December 31	8,274	9,042	$ 7,755
Funded status December 31	1,373	520
Recognized as:
Other Assets	1,785	1,019
Accrued and other current liabilities	(18)	(19)
Other Noncurrent Liabilities	$ (394)	$ (480)