Investments (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) Item	Dec. 31, 2021 USD ($) Item	Dec. 31, 2020 USD ($)
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
Unrealized loss from transfer	53.0
Additional contractual commitments	$ 2,600.0
Contractual commitments, investment period expiration date	Dec. 31, 2026
Other invested assets	$ 4,085.0	2,920.0
Fair Value	$ 22,236.0	$ 22,308.0
Number of securities held as primary beneficiary \| Item	0	0
Maximum exposure to loss	$ 4,100.0	$ 2,900.0
Commitments to fund investments	2,100.0
Securities, carrying value	1,400.0
Policy Cash Surrender Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other invested assets	939.0
Recorded an Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position		16.0
Gross unrealized depreciation		(0.4)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position	19,647.0	9,335.0
Gross unrealized losses on investments in unrealized loss position	1,982.0	203.0
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	1,217.0	128.0
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	764.0	75.0
Fair Value	$ 22,236.0	$ 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	0.20%	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%
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	$ 1,100.0	$ 116.0
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	$ 732.0	$ 72.0

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