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Employee Retirement Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Qualified        
Net periodic pension cost for the company's defined-benefit pension plans        
Service cost     $ 1 $ 1
Interest cost $ 7 $ 9 13 19
Expected return on plan assets (5) (11) (11) (22)
Amortization of net loss 5 6 11 10
Net periodic pension cost 7 4 14 8
Non-Qualified        
Net periodic pension cost for the company's defined-benefit pension plans        
Service cost     0 0
Interest cost 1 2 2 3
Expected return on plan assets 0 0 0 0
Amortization of net loss 1 0 2 1
Net periodic pension cost $ 2 $ 2 $ 4 $ 4