Employee Benefit Plans, Pre-Tax Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net (gain) loss reclassified into income:
Total changes in other comprehensive income (loss)	$ 335	$ 378	$ (80)
Pension Plans [Member]
Net gain (loss) arising during the year:
Net actuarial gain (loss)	158	308	(105)
Prior service cost	0	(4)	(5)
Net (gain) loss reclassified into income:
Net actuarial (gain) loss	53	81	74
Prior service credit	(18)	(18)	(19)
Settlement loss	61	8	5
Effect of exchange rates	0	2	0
Total changes in other comprehensive income (loss)	254	377	(50)
Other Postretirement Benefit Plans [Member]
Net gain (loss) arising during the year:
Net actuarial gain (loss)	86	9	(23)
Prior service cost	0	0	0
Net (gain) loss reclassified into income:
Net actuarial (gain) loss	(1)	(1)	0
Prior service credit	(4)	(7)	(7)
Settlement loss	0	0	0
Effect of exchange rates	0	0	0
Total changes in other comprehensive income (loss)	$ 81	$ 1	$ (30)