Employee Benefit Plans - Components of Net Periodic Benefit Cost (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 3	$ 3
Interest cost	(28)	(24)	(84)	(71)
Expected return on plan assets	(50)	(51)	(151)	(153)
Amortization of prior service credit	0	0	0	0
Amortization of actuarial loss	(15)	(17)	(46)	(52)
Net periodic cost (benefit)	(6)	(9)	(18)	(27)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	(1)	0	(3)	(2)
Expected return on plan assets	(1)	0	(2)	(2)
Amortization of prior service credit	(2)	(2)	(5)	(5)
Amortization of actuarial loss	(2)	(2)	(5)	(6)
Net periodic cost (benefit)	$ 0	$ 0	$ 1	$ 1