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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, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Total number of fixed maturity AFS securities in an unrealized loss position | security 5,054 2,577
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 39,938 $ 16,570
Greater Than Twelve Months 4,169 1,781
Fair Value - Total 44,107 18,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2,287 308
Greater Than Twelve Months 601 119
Gross Unrealized Losses - Total 2,888 427
Unrealized holding gains (losses) arising during the period 7 8
Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 29,692 10,611
Greater Than Twelve Months 3,208 1,386
Fair Value - Total 32,900 11,997
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,890 230
Greater Than Twelve Months 510 96
Gross Unrealized Losses - Total 2,400 326
U.S. Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 36 6
Greater Than Twelve Months 24 26
Fair Value - Total 60 32
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1  
Greater Than Twelve Months 4 2
Gross Unrealized Losses - Total 5 2
State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 1,231 498
Greater Than Twelve Months 64 19
Fair Value - Total 1,295 517
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 134 10
Greater Than Twelve Months 11 1
Gross Unrealized Losses - Total 145 11
Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 69 61
Greater Than Twelve Months 82 56
Fair Value - Total 151 117
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 7 3
Greater Than Twelve Months 10 2
Gross Unrealized Losses - Total 17 5
RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 881 261
Greater Than Twelve Months 31 20
Fair Value - Total 912 281
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 37 3
Greater Than Twelve Months 3 1
Gross Unrealized Losses - Total 40 4
CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 999 440
Greater Than Twelve Months 215 33
Fair Value - Total 1,214 473
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 44 12
Greater Than Twelve Months 27 2
Gross Unrealized Losses - Total 71 14
ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 6,935 4,646
Greater Than Twelve Months 475 165
Fair Value - Total 7,410 4,811
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 169 49
Greater Than Twelve Months 20 5
Gross Unrealized Losses - Total 189 54
Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 95 47
Greater Than Twelve Months 70 76
Fair Value - Total 165 123
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 5 1
Greater Than Twelve Months 16 10
Gross Unrealized Losses - Total $ 21 $ 11