Employee Benefit Plans - Schedule of Changes in Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in Plan Assets:
Fair Value of Plan Assets at Beginning of Plan Year	$ 3,016,000,000
Non-qualified Employer Contributions	0	$ 0	$ 0
Fair Value of Plan Assets at End of Plan Year	2,327,000,000	3,016,000,000
Capitalized service costs	4,000,000	4,000,000
Pension Benefits
Actuarial Present Value of Benefit Obligation
Accumulated Benefit Obligation	2,285,000,000	2,909,000,000
Projected Benefit Obligation	2,368,000,000	3,022,000,000	3,257,000,000
Change in Projected Benefit Obligation:
Projected Benefit Obligation at Beginning of Plan Year	3,022,000,000	3,257,000,000
Service Cost	36,000,000	45,000,000
Interest Cost	64,000,000	55,000,000	82,000,000
Actuarial Gain	(570,000,000)	(142,000,000)
Benefits Paid	(184,000,000)	(193,000,000)
Benefit Obligation at End of Plan Year	2,368,000,000	3,022,000,000	3,257,000,000
Change in Plan Assets:
Fair Value of Plan Assets at Beginning of Plan Year	3,016,000,000	3,000,000,000
Actual (Loss) Return on Plan Assets	(523,000,000)	187,000,000
Benefits Paid	(184,000,000)	(193,000,000)
Fair Value of Plan Assets at End of Plan Year	2,327,000,000	3,016,000,000	$ 3,000,000,000
Funded Status at End of Plan Year	(41,000,000)	(6,000,000)
Pension Benefits | Nonqualified Plan
Change in Plan Assets:
Non-qualified Employer Contributions	$ 18,000,000	$ 22,000,000