Post-Employment Benefits - Plan Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	$ 11,675	$ 13,838
U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	2,866	3,664
U.S. mid and small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	693	936
International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	2,401	2,902
U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	362	366
Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,318	1,709
Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	419	626
Other, asset backed securities, bank loans, interest rate swap positions and diversified fixed income vehicles
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	775	510
Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,678	1,934
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	154	266
Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,009	925
Quoted Prices in Active Markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	3,750	4,958
Quoted Prices in Active Markets | U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,840	2,403
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	684	876
Quoted Prices in Active Markets | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	454	591
Quoted Prices in Active Markets | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	5	21
Quoted Prices in Active Markets | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	123	434
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	16	33
Quoted Prices in Active Markets | Other, asset backed securities, bank loans, interest rate swap positions and diversified fixed income vehicles
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	297	87
Quoted Prices in Active Markets | Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	304	476
Quoted Prices in Active Markets | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	20	35
Quoted Prices in Active Markets | Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	7	2
Significant Other Observable Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,306	1,697
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	341	325
Significant Other Observable Inputs | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	890	1,260
Significant Other Observable Inputs | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	0	1
Significant Other Observable Inputs | Other, asset backed securities, bank loans, interest rate swap positions and diversified fixed income vehicles
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	75	111
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	4
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	4
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, asset backed securities, bank loans, interest rate swap positions and diversified fixed income vehicles
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	6,618	7,179
Measured at NAV | U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,026	1,261
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	56
Measured at NAV | International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,947	2,311
Measured at NAV | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	16	20
Measured at NAV | Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	305	15
Measured at NAV | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	403	592
Measured at NAV | Other, asset backed securities, bank loans, interest rate swap positions and diversified fixed income vehicles
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	403	312
Measured at NAV | Absolute return funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	1,374	1,458
Measured at NAV | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	134	231
Measured at NAV | Other, private funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at fair value	$ 1,002	$ 923