Employee Benefit Plans - PAC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 4	$ 3	$ 6
Interest cost	7	5	14	10
Expected return on plan assets	(10)	(7)	(18)	(14)
Net amortization	0	(1)	(1)	(1)
Net periodic benefit (credit) cost	(1)	1	(2)	1
PAC | Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	2	2	5	4
Expected return on plan assets	(4)	(3)	(7)	(5)
Net amortization	0	0	(1)	0
Net periodic benefit (credit) cost	(1)	0	(2)	0
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	9	13
Interest cost	27	19	55	38
Expected return on plan assets	(31)	(27)	(62)	(54)
Net amortization	3	5	7	9
Net periodic benefit (credit) cost	4	3	4	8
U.S. | PAC | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	9	7	19	14
Expected return on plan assets	(12)	(11)	(24)	(21)
Net amortization	3	4	6	8
Net periodic benefit (credit) cost	$ 0	$ 0	$ 1	$ 1