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