Investments - Commercial Mortgage Loan Portfolio (Details) - Real Estate Loan - Commercial Portfolio Segment $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss		$ 1,614
Carrying value, after allowance for credit loss, including assets held for sale	$ 1,533
Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio		1.89
Average Loan-to-Value Ratio		60.00%
Average Debt Service Coverage Ratio, including assets held for sale	1.82
Average Loan-to-Value Ratio, including assets held for sale	0.64
Below 60%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss		$ 901
Carrying value, after allowance for credit loss, including assets held for sale	$ 802
Below 60% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio		2.12
Average Debt Service Coverage Ratio, including assets held for sale	2.13
60% to 79%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss		$ 564
Carrying value, after allowance for credit loss, including assets held for sale	$ 574
60% to 79% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio		1.73
Average Debt Service Coverage Ratio, including assets held for sale	1.77
80% to 100%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss		$ 149
Carrying value, after allowance for credit loss, including assets held for sale	$ 157
80% to 100% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio		1.17
Average Debt Service Coverage Ratio, including assets held for sale	0.65