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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | $ 276 | $ 117
Greater Than Twelve Months | 124 | 81
Continuous Unrealized Loss Position, Total | 400 | 198
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13,617 | 4,808
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,593 | 1,068
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 15,210 | $ 5,876
Total number of fixed maturity AFS securities in an unrealized loss position | security | 1,753 | 802
Unrealized holding gains (losses) arising during the period | $ 8 | $ 1
Corporate Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 218 | 92
Greater Than Twelve Months | 106 | 58
Continuous Unrealized Loss Position, Total | 324 | 150
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,685 | 3,039
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,289 | 607
Debt Securities, Available-for-sale, Unrealized Loss Position | 9,974 | 3,646
U.S. Government Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 1
Greater Than Twelve Months | 1 |
Continuous Unrealized Loss Position, Total | 2 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 29 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 32 | 28
State And Municipal Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 10 |
Greater Than Twelve Months | 1 |
Continuous Unrealized Loss Position, Total | 11 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 485 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 17 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 502 |
Foreign Government Bonds [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 6 | 1
Greater Than Twelve Months | 1 |
Continuous Unrealized Loss Position, Total | 7 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 152 | 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 28 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 180 | 57
RMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 2 | 1
Greater Than Twelve Months | 1 |
Continuous Unrealized Loss Position, Total | 3 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 206 | 45
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19 | 7
Debt Securities, Available-for-sale, Unrealized Loss Position | 225 | 52
CMBS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 9 |
Greater Than Twelve Months | 1 |
Continuous Unrealized Loss Position, Total | 10 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 365 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 381 |
ABS [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 29 | 9
Greater Than Twelve Months | 2 | 6
Continuous Unrealized Loss Position, Total | 31 | 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,662 | 1,527
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 106 | 358
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,768 | 1,885
Hybrid And Redeemable Preferred Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI |  |
Less Than or Equal to Twelve Months | 1 | 13
Greater Than Twelve Months | 11 | 17
Continuous Unrealized Loss Position, Total | 12 | 30
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 33 | 112
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 115 | 96
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 148 | $ 208

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