Employee Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Before tax basis amount in accumulated other comprehensive loss.
Total recognized at December 31	$ 3,446	$ 4,979
Other Benefits
Before tax basis amount in accumulated other comprehensive loss.
Net actuarial loss	(392)	134
Prior service (credit) costs	(115)	(159)
Total recognized at December 31	(507)	(25)
U.S. | Pension Benefits
Before tax basis amount in accumulated other comprehensive loss.
Net actuarial loss	3,147	4,007
Prior service (credit) costs	40	2
Total recognized at December 31	3,187	4,009
Int’l. | Pension Benefits
Before tax basis amount in accumulated other comprehensive loss.
Net actuarial loss	659	920
Prior service (credit) costs	107	75
Total recognized at December 31	$ 766	$ 995