Employee Retirement Plans - Schedule of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Qualified
Net periodic pension cost for the company's defined-benefit pension plans
Service cost	$ 0	$ 1	$ 1	$ 2
Interest cost	0	5	1	13
Expected return on plan assets	0	(3)	(1)	(7)
Settlement loss	0	406	0	406
Amortization of net loss	1	5	2	11
Net periodic pension cost	1	414	3	425
Non-Qualified
Net periodic pension cost for the company's defined-benefit pension plans
Service cost	0	0	0	0
Interest cost	1	0	2	1
Expected return on plan assets	0	0	0	0
Settlement loss	0	0	0	0
Amortization of net loss	0	1	1	2
Net periodic pension cost	$ 1	$ 1	$ 3	$ 3