Post-Employment Benefits - Plan Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	$ 14,420	$ 13,373
U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	3,873	3,425
U.S. mid and small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	918	814
International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	2,827	2,725
U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	441	391
Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,558	1,519
Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	627	586
Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	916	863
Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,814	1,669
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	314	276
Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,132	1,105
Quoted Prices in Active Markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	4,952	4,384
Quoted Prices in Active Markets | U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	2,714	2,305
Quoted Prices in Active Markets | U.S. mid and small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	909	807
Quoted Prices in Active Markets | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	518	493
Quoted Prices in Active Markets | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	7	5
Quoted Prices in Active Markets | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	120	125
Quoted Prices in Active Markets | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	43	36
Quoted Prices in Active Markets | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	335	322
Quoted Prices in Active Markets | Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	283	270
Quoted Prices in Active Markets | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	16	16
Quoted Prices in Active Markets | Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	7	5
Significant Other Observable Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,629	1,535
Significant Other Observable Inputs | U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Other Observable Inputs | U.S. mid and small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Other Observable Inputs | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Other Observable Inputs | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	420	371
Significant Other Observable Inputs | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,032	1,055
Significant Other Observable Inputs | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	2	3
Significant Other Observable Inputs | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	175	106
Significant Other Observable Inputs | Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Other Observable Inputs | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Other Observable Inputs | Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1	1
Significant Unobservable Inputs | U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | U.S. mid and small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1	1
Significant Unobservable Inputs | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Significant Unobservable Inputs | Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	0
Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	7,838	7,453
Measured at NAV | U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,159	1,120
Measured at NAV | U.S. mid and small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	8	6
Measured at NAV | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	2,309	2,232
Measured at NAV | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	14	15
Measured at NAV | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	406	339
Measured at NAV | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	582	547
Measured at NAV | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	406	435
Measured at NAV | Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,531	1,399
Measured at NAV | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	298	260
Measured at NAV | Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	$ 1,125	$ 1,100