Pension and Postretirement Benefit Plans and Defined Contribution Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 29	$ 36	$ 38
Interest cost		27	29	49
Expected return on plan assets		(47)	(39)	(36)
Amortization of prior service credits/(credits)		(130)	(151)	(170)
Actuarial (gains)/losses	[1]	(440)	(167)	(165)
Curtailments		(18)	(82)	0
Special termination benefits		1	2	0
Net periodic benefit cost/(credit) reported in income		(578)	(372)	(282)
Cost/(credit) reported in Other comprehensive income/(loss)		169	107	114
Cost/(credit) recognized in Comprehensive income		(410)	(265)	(168)
U.S. [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	0	0
Interest cost		534	455	533
Expected return on plan assets		(862)	(1,052)	(1,015)
Amortization of prior service credits/(credits)		2	(2)	(3)
Actuarial (gains)/losses	[1]	225	(684)	1,152
Curtailments		0	0	0
Special termination benefits		18	17	1
Net periodic benefit cost/(credit) reported in income		(84)	(1,265)	668
Cost/(credit) reported in Other comprehensive income/(loss)		(2)	2	5
Cost/(credit) recognized in Comprehensive income		(86)	(1,264)	674
International [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		116	130	146
Interest cost		157	146	164
Expected return on plan assets		(296)	(327)	(314)
Amortization of prior service credits/(credits)		(1)	(1)	(3)
Actuarial (gains)/losses	[1]	(11)	(690)	148
Curtailments		(11)	(4)	0
Special termination benefits		1	0	0
Net periodic benefit cost/(credit) reported in income		(45)	(746)	141
Cost/(credit) reported in Other comprehensive income/(loss)		(1)	4	5
Cost/(credit) recognized in Comprehensive income		$ (46)	$ (742)	$ 145

[1] Reflects: (i) actuarial remeasurement net gains in 2022, primarily due to increases in discount rates, partially offset by unfavorable plan asset performance, (ii) actuarial remeasurement gains in 2021, primarily due to favorable plan asset performance and increases in discount rates, and (iii) actuarial remeasurement net losses in 2020, primarily due to decreases in discount rates partially offset by favorable plan asset performance.