Investments (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) Item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Item
Schedule of Available-for-sale Securities [Line Items]
Reclassification of specific investments from fixed maturity securities, available for sale at fair value to fixed maturity securities, held to maturity at amortized cost net of credit allowances	$ 722.0	$ 722.0
Unrealized loss from transfer	(53.0)
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	817.0	817.0
Fixed maturities - held to maturity, at amortized cost, credit allowances	9.0	9.0
Additional contractual commitments	2,500.0	$ 2,500.0
Contractual commitments, investment period expiration date		Dec. 31, 2026
Fair Value	21,009.0	$ 21,009.0		$ 22,308.0
Number of securities held as primary beneficiary \| Item		0		0
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities - held to maturity, at amortized cost	846.0	$ 846.0
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	817.0	817.0
Fixed maturities - held to maturity, gross unrealized appreciation	1.0	1.0
Fixed maturities - held to maturity, gross unrealized depreciation	21.0	21.0
Fixed maturities - held to maturity, at amortized cost, credit allowances	9.0	9.0
Aggregate market value of investments in unrealized loss position	17,983.0	17,983.0		$ 9,335.0
Gross unrealized losses on investments in unrealized loss position	2,310.0	2,310.0		203.0
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	1,659.0	1,659.0		128.0
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	651.0	651.0		75.0
Fair Value	21,009.0	$ 21,009.0		$ 22,308.0
Fixed Maturity Securities [Member] \| Sales Revenue, Net [Member] \| Issuer with the second the largest unrealized loss position [Member] \| Issuer [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer		0.90%		0.50%
Fixed Maturity Securities [Member] \| US Government Securities [Member] \| Sales Revenue, Net [Member] \| Issuer [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer		5.20%		2.70%
Recorded an Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position	23.0	$ 23.0		$ 16.0
Gross unrealized losses on investments in unrealized loss position	19.0	19.0		0.4
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	19.0	19.0
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities - held to maturity, at amortized cost	653.0	653.0
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	639.0	639.0
Fixed maturities - held to maturity, gross unrealized appreciation	1.0	1.0
Fixed maturities - held to maturity, gross unrealized depreciation	10.0	10.0
Fixed maturities - held to maturity, at amortized cost, credit allowances	6.0	6.0
Aggregate market value of investments in unrealized loss position	2,882.0	2,882.0		1,996.0
Gross unrealized losses on investments in unrealized loss position	164.0	164.0		12.0
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	158.0	158.0		11.0
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	5.0	5.0		1.0
Fair Value	3,772.0	3,772.0		3,582.0
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities - held to maturity, at amortized cost	160.0	160.0
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	147.0	147.0
Fixed maturities - held to maturity, gross unrealized appreciation
Fixed maturities - held to maturity, gross unrealized depreciation	11.0	11.0
Fixed maturities - held to maturity, at amortized cost, credit allowances	2.0	2.0
Aggregate market value of investments in unrealized loss position	5,243.0	5,243.0		2,605.0
Gross unrealized losses on investments in unrealized loss position	636.0	636.0		63.0
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	447.0	447.0		38.0
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	189.0	189.0		24.0
Fair Value	6,397.0	6,397.0		7,557.0
Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	1,500.0	1,500.0		116.0
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	616.0	616.0		72.0
Private Placement Liquidity Sweep [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	368.0	368.0
Maximum exposure to loss	3,100.0	3,100.0		$ 2,900.0
Commitments to fund investments	$ 2,200.0	$ 2,200.0

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