Fair Value (Quantitative Information) (Details)	Mar. 31, 2022	Dec. 31, 2021
Minimum | Interest rate | Measurement Input, Swap Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	233	151
Minimum | Interest rate | Measurement Input, Price Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.01	0.01
Minimum | Foreign currency exchange rate | Measurement Input, Swap Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	8	2
Minimum | Credit | Measurement Input, Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	95	96
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 0 - 40
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0	0
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 41 - 60
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0003	0.0003
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 61 - 115
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0012	0.0012
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 1 - 10
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0	0.0025
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 11 - 20
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0050	0.0050
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 21 - 116
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0050	0.0050
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Utilization Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0	0
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Withdrawal Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0	0
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Long-Term Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0843	0.0769
Minimum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Nonperformance risk spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0006	0.0004
Minimum | U.S. corporate and foreign corporate | Valuation Technique, Matrix Pricing | Measurement Input, Offered Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0	1
Minimum | U.S. corporate and foreign corporate | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0	0
Minimum | U.S. corporate and foreign corporate | Valuation Technique, Consensus Pricing Model | Measurement Input, Offered Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	98	99
Minimum | RMBS | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0	0
Minimum | ABS & CLO | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	3	3
Maximum | Interest rate | Measurement Input, Swap Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	246	200
Maximum | Interest rate | Measurement Input, Price Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.02	0.01
Maximum | Foreign currency exchange rate | Measurement Input, Swap Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	1,938	305
Maximum | Credit | Measurement Input, Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	137	133
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 0 - 40
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0017	0.0017
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 41 - 60
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0075	0.0075
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 61 - 115
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	1	1
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 1 - 10
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	1	1
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 11 - 20
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	1	1
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 21 - 116
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	1	1
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Utilization Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.22	0.22
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Withdrawal Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.20	0.20
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Long-Term Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.25	0.25
Maximum | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Nonperformance risk spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0155	0.0145
Maximum | U.S. corporate and foreign corporate | Valuation Technique, Matrix Pricing | Measurement Input, Offered Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	147	165
Maximum | U.S. corporate and foreign corporate | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	107	117
Maximum | U.S. corporate and foreign corporate | Valuation Technique, Consensus Pricing Model | Measurement Input, Offered Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	103	104
Maximum | RMBS | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	119	121
Maximum | ABS & CLO | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	104	110
Weighted Average | Interest rate | Measurement Input, Swap Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	242	188
Weighted Average | Interest rate | Measurement Input, Price Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	0.01	0.01
Weighted Average | Foreign currency exchange rate | Measurement Input, Swap Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	186	134
Weighted Average | Credit | Measurement Input, Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	108	109
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 0 - 40
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0008	0.0008
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 41 - 60
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0027	0.0027
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 61 - 115
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0207	0.0208
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 1 - 10
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0624	0.0630
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 11 - 20
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0518	0.0522
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 21 - 116
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0518	0.0522
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Utilization Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0022	0.0022
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Withdrawal Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0370	0.0372
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Long-Term Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.1860	0.1860
Weighted Average | Embedded derivatives direct, assumed and ceded guaranteed minimum benefits | Nonperformance risk spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives direct, assumed and ceded guaranteed minimum benefits	0.0035	0.0035
Weighted Average | U.S. corporate and foreign corporate | Valuation Technique, Matrix Pricing | Measurement Input, Offered Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	100	109
Weighted Average | U.S. corporate and foreign corporate | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	96	100
Weighted Average | U.S. corporate and foreign corporate | Valuation Technique, Consensus Pricing Model | Measurement Input, Offered Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	99	100
Weighted Average | RMBS | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	96	99
Weighted Average | ABS & CLO | Valuation Technique, Market Approach | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input	97	102