Employee Benefit Plans - Summary of Balance Sheet Components (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Consolidated Balance Sheet for pension and other postretirement benefit plans
Noncurrent employee benefit plans	$ (4,357)	$ (6,248)
Pension Benefits | U.S.
Consolidated Balance Sheet for pension and other postretirement benefit plans
Deferred charges and other assets	26	36
Accrued liabilities	(210)	(303)
Noncurrent employee benefit plans	(1,587)	(2,780)
Net amount recognized at December 31	(1,771)	(3,047)
Pension Benefits | Int’l.
Consolidated Balance Sheet for pension and other postretirement benefit plans
Deferred charges and other assets	759	696
Accrued liabilities	(62)	(142)
Noncurrent employee benefit plans	(765)	(955)
Net amount recognized at December 31	(68)	(401)
Other Benefits
Consolidated Balance Sheet for pension and other postretirement benefit plans
Deferred charges and other assets	0	0
Accrued liabilities	(152)	(151)
Noncurrent employee benefit plans	(1,786)	(2,338)
Net amount recognized at December 31	$ (1,938)	$ (2,489)