Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Plan | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 5	$ 8	$ 9
Interest cost	27	27	53	55
Expected return on plan assets	(33)	(31)	(64)	(62)
Settlement	0	0	0	(5)
Net amortization	2	3	4	7
Net periodic benefit credit	1	4	1	4
Pension Plan | U.S. | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	5	6
Interest cost	8	8	16	16
Expected return on plan assets	(8)	(8)	(16)	(16)
Settlement	0	0	0	(5)
Net amortization	(1)	0	(1)	0
Net periodic benefit credit	2	3	4	1
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	2	3
Interest cost	8	7	15	14
Expected return on plan assets	(9)	(10)	(17)	(18)
Net amortization	0	0	(1)	(1)
Net periodic benefit credit	0	(1)	(1)	(2)
Other Postretirement Plans | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	3	3	6	6
Expected return on plan assets	(4)	(4)	(8)	(8)
Net amortization	1	0	1	0
Net periodic benefit credit	$ 1	$ 0	$ 1	$ 0