Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 31	$ 51	$ 62	$ 102
Interest cost	55	47	110	94
Expected return on plan assets	(63)	(76)	(126)	(154)
Amortization of unrecognized (gain) loss	2	31	4	61
Amortization of prior service credit	0	0	0	0
Other	1	0	1	1
Total	26	53	51	104
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	2	4
Interest cost	11	8	21	15
Expected return on plan assets	(1)	(1)	(1)	(1)
Amortization of unrecognized (gain) loss	(10)	(4)	(19)	(7)
Amortization of prior service credit	(28)	(28)	(56)	(56)
Other	0	0	0	0
Total	$ (27)	$ (23)	$ (53)	$ (45)