Employment Benefit Plans Net Cost (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Number of months for highest consecutive compensation		60 months
Number of years of salaried employees to qualify for pension plan retirement		10 years
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 120	$ 0	$ 0	$ 117
Reduction in projected benefit obligation	117
Amortization of prior service credits		0	0	3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		25	21	32
Interest cost		56	70	81
Expected return on plan assets		(176)	(167)	(160)
Amortization of net loss		2	1	0
Amortization of prior service credit	3	0	0	(3)
Curtailment gain	$ (120)	0	0	(117)
Settlement loss (gain)		(1)	(1)	5
Net (benefit) cost recognized		$ (94)	$ (76)	$ (162)