Federal Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	$ 414
Tax credit carryforward, valuation allowance	0
Unrecognized tax benefits that would impact effective tax rate	66	$ 43
Possible decrease in unrecognized tax benefits	35
Unrecognized tax benefits, income tax penalties and interest expense	0	0	$ 0
Unrecognized tax benefits, income tax penalties and interest accrued	0	$ 0
Capital Loss Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	442
Internal Revenue Service (IRS)
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	$ 103