Employee Benefit Plans - PAC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 4	$ 6	$ 6
Interest cost	5	5	10	10
Expected return on plan assets	(7)	(6)	(14)	(11)
Net amortization	(1)	(1)	(1)	(2)
Net periodic benefit cost (credit)	1	2	1	3
PAC | Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	2	2	4	4
Expected return on plan assets	(3)	(2)	(5)	(4)
Net amortization	0	0	0	0
Net periodic benefit cost (credit)	0	1	0	1
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	8	13	15
Interest cost	19	18	38	38
Expected return on plan assets	(27)	(36)	(54)	(69)
Net amortization	5	7	9	13
Net periodic benefit cost (credit)	3	(3)	8	(3)
U.S. | PAC | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	7	7	14	14
Expected return on plan assets	(11)	(14)	(21)	(27)
Net amortization	4	5	8	10
Net periodic benefit cost (credit)	$ 0	$ (2)	$ 1	$ (3)