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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) - Fixed Maturity AFS Securities [Member] $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | $ 16,016 | $ 4,808
Greater Than Twelve Months | 974 | 1,068
Fair Value - Total | 16,990 | 5,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 727 | 117
Greater Than Twelve Months | 76 | 81
Gross Unrealized Losses - Total | $ 803 | $ 198
Total number of fixed maturity AFS securities in an unrealized loss position | security | 1,749 | 802
Unrealized holding gains (losses) arising during the period | $ 2 | $ 1
Corporate Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 12,029 | 3,039
Greater Than Twelve Months | 709 | 607
Fair Value - Total | 12,738 | 3,646
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 633 | 92
Greater Than Twelve Months | 60 | 58
Gross Unrealized Losses - Total | 693 | 150
U.S. Government Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 25 | 28
Fair Value - Total | 25 | 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 3 | 1
Gross Unrealized Losses - Total | 3 | 1
State And Municipal Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 767 |
Fair Value - Total | 767 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 34 |
Gross Unrealized Losses - Total | 34 |
Foreign Government Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 99 | 57
Fair Value - Total | 99 | 57
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 6 | 1
Gross Unrealized Losses - Total | 6 | 1
RMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 200 | 45
Greater Than Twelve Months | 7 | 7
Fair Value - Total | 207 | 52
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 3 | 1
Gross Unrealized Losses - Total | 3 | 1
CMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 371 |
Fair Value - Total | 371 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 16 |
Gross Unrealized Losses - Total | 16 |
ABS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 2,401 | 1,527
Greater Than Twelve Months | 167 | 358
Fair Value - Total | 2,568 | 1,885
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 24 | 9
Greater Than Twelve Months | 3 | 6
Gross Unrealized Losses - Total | 27 | 15
Hybrid And Redeemable Preferred Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Less Than or Equal to Twelve Months | 124 | 112
Greater Than Twelve Months | 91 | 96
Fair Value - Total | 215 | 208
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 8 | 13
Greater Than Twelve Months | 13 | 17
Gross Unrealized Losses - Total | $ 21 | $ 30

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