Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan | U.S.
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)
Settlement	0	0	(5)	2
Net amortization	3	5	7	9
Net periodic benefit (credit) cost	4	3	4	8
Pension Plan | U.S. | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4	6	9
Interest cost	8	5	16	10
Expected return on plan assets	(8)	(7)	(16)	(14)
Settlement	0	0	(5)	2
Net amortization	0	1	0	1
Net periodic benefit (credit) cost	3	3	1	8
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
Other Postretirement Plans | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	2	4
Interest cost	3	2	6	4
Expected return on plan assets	(4)	(3)	(8)	(7)
Net amortization	0	(1)	0	(1)
Net periodic benefit (credit) cost	$ 0	$ 0	$ 0	$ 0