Investments - Commercial Mortgage Loans, Including Disposal Groups (Details) - Real Estate Loan - Commercial Portfolio Segment $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2024 USD ($)
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale		$ 1,351
Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	1.70
Average Loan-to-Value Ratio, including assets held for sale	0.69
Below 60%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale		547
Below 60% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	2.07
60% to 79%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale		595
60% to 79% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	1.83
80% to 100%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss, including assets held for sale		$ 209
80% to 100% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio, including assets held for sale	0.51