Employee Benefit Plans - Components of Net Periodic Benefit Cost (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	(45)	(28)	(90)	(56)
Expected return on plan assets	(59)	(50)	(118)	(101)
Amortization of prior service credit	0	0	0	0
Amortization of actuarial loss	(7)	(16)	(14)	(31)
Net periodic cost (benefit)	(6)	(5)	(12)	(12)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	(2)	(1)	(4)	(2)
Expected return on plan assets	(1)	(1)	(1)	(1)
Amortization of prior service credit	(1)	(1)	(3)	(3)
Amortization of actuarial loss	(1)	(1)	(2)	(3)
Net periodic cost (benefit)	$ 1	$ 0	$ 2	$ 1