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Investments (Amortized Cost And Fair Values Of Securities) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost $ 39,133 $ 38,368
Gross Unrealized Gains 3,485 3,225
Gross Unrealized Losses 419 626
Estimated Fair Value 42,199 40,967
Unrealized OTTI Losses (Gains) 35 97
Corporate And Other Bonds [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 19,324 19,086
Gross Unrealized Gains 2,013 1,946
Gross Unrealized Losses 61 154
Estimated Fair Value 21,276 20,878
States, Municipalities And Political Subdivisions [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 9,234 9,018
Gross Unrealized Gains 1,042 900
Gross Unrealized Losses 93 136
Estimated Fair Value 10,183 9,782
Residential Mortgage-Backed [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 5,958 5,786
Gross Unrealized Gains 175 172
Gross Unrealized Losses 139 183
Estimated Fair Value 5,994 5,775
Unrealized OTTI Losses (Gains) 37 99
Commercial Mortgage-Backed [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 1,297 1,365
Gross Unrealized Gains 68 48
Gross Unrealized Losses 36 59
Estimated Fair Value 1,329 1,354
Unrealized OTTI Losses (Gains) (2) (2)
Other Asset-Backed [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 1,022 946
Gross Unrealized Gains 18 13
Gross Unrealized Losses 1 4
Estimated Fair Value 1,039 955
Asset-Backed Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 2,722  
Gross Unrealized Losses 176  
Estimated Fair Value 2,546  
U.S. Treasury And Obligations Of Government-Sponsored Enterprises [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 224 479
Gross Unrealized Gains 12 14
Estimated Fair Value 236 493
Foreign Government [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 634 608
Gross Unrealized Gains 21 28
Estimated Fair Value 655 636
Redeemable Preferred Stock [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 105 51
Gross Unrealized Gains 8 7
Estimated Fair Value 113 58
Fixed Maturities Available-For-Sale [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 37,798 37,339
Gross Unrealized Gains 3,357 3,128
Gross Unrealized Losses 330 536
Estimated Fair Value 40,825 39,931
Unrealized OTTI Losses (Gains) 35 97
Fixed Maturities, Trading [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 373 127
Gross Unrealized Losses 25 18
Estimated Fair Value 348 109
Common Stock [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 32 30
Gross Unrealized Gains 17 17
Gross Unrealized Losses 1  
Estimated Fair Value 48 47
Preferred Stock [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 246 258
Gross Unrealized Gains 4 4
Gross Unrealized Losses   5
Estimated Fair Value 250 257
Equity Securities Available-For-Sale [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 278 288
Gross Unrealized Gains 21 21
Gross Unrealized Losses 1 5
Estimated Fair Value 298 304
Equity Securities, Trading [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost, Trading securities 684 614
Gross Unrealized Gains, Trading securities 107 76
Gross Unrealized Losses, Trading securities 63 67
Estimated Fair Value, Trading Securities 728 623
Equity Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 962 902
Gross Unrealized Gains 128 97
Gross Unrealized Losses 64 72
Estimated Fair Value 1,026 927
Fixed Maturity Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 38,171 37,466
Gross Unrealized Gains 3,357 3,128
Gross Unrealized Losses 355 554
Estimated Fair Value 41,173 40,040
Unrealized OTTI Losses (Gains) 35 97
Fixed Maturity Securities [Member] | Asset-Backed Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 8,277 8,097
Gross Unrealized Gains 261 233
Gross Unrealized Losses 176 246
Estimated Fair Value 8,362 8,084
Unrealized OTTI Losses (Gains) $ 35 $ 97