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Gross Unrealized Losses and Fair Value of Investment Securities (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Securities
Dec. 31, 2012
Securities
Dec. 31, 2011
Securities
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value $ 6,244 $ 5,612 $ 8,970
Gross unrealized losses (490) [1] (601) [2] (1,419) [3]
Number of securities in a continuous loss position 950 983 1,486
Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 4,307 2,951 4,719
Gross unrealized losses (129) (54) (211)
Number of securities in a continuous loss position 532 425 629
12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,937 2,661 4,251
Gross unrealized losses (361) [4] (547) [5] (1,208) [6]
Number of securities in a continuous loss position 418 558 857
Investment grade
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 5,227 4,377 7,358
Gross unrealized losses (283) [1] (252) [2] (742) [3]
Number of securities in a continuous loss position 614 591 981
Investment grade | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 4,070 2,761 4,292
Gross unrealized losses (121) (43) (165)
Number of securities in a continuous loss position 439 356 502
Investment grade | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,157 1,616 3,066
Gross unrealized losses (162) [4] (209) [5] (577) [6]
Number of securities in a continuous loss position 175 235 479
Below investment grade
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,017 [7] 1,235 [8] 1,612 [9]
Gross unrealized losses (207) [1],[7] (349) [2],[8] (677) [3],[9]
Number of securities in a continuous loss position 336 [7] 392 [8] 505 [9]
Below investment grade | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 237 [7] 190 [8] 427 [9]
Gross unrealized losses (8) [7] (11) [8] (46) [9]
Number of securities in a continuous loss position 93 [7] 69 [8] 127 [9]
Below investment grade | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 780 [7] 1,045 [8] 1,185 [9]
Gross unrealized losses (199) [4],[7] (338) [5],[8] (631) [6],[9]
Number of securities in a continuous loss position 243 [7] 323 [8] 378 [9]
Fixed maturity securities
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 6,189 5,546 8,853
Gross unrealized losses (487) [1] (595) [2] (1,405) [3]
Number of securities in a continuous loss position 897 938 1,434
Fixed maturity securities | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 4,264 2,899 4,627
Gross unrealized losses (127) (50) (200)
Number of securities in a continuous loss position 485 393 590
Fixed maturity securities | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,925 2,647 4,226
Gross unrealized losses (360) [4] (545) [5] (1,205) [6]
Number of securities in a continuous loss position 412 545 844
Fixed maturity securities | Less Than 20 Percent Below Cost
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 5,881 5,050 7,303
Gross unrealized losses (268) [1] (244) [2] (408) [3]
Number of securities in a continuous loss position 746 730 983
Fixed maturity securities | Less Than 20 Percent Below Cost | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 4,257 2,899 4,545
Gross unrealized losses (125) (50) (156)
Number of securities in a continuous loss position 479 393 548
Fixed maturity securities | Less Than 20 Percent Below Cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,624 2,151 2,758
Gross unrealized losses (143) [4] (194) [5] (252) [6]
Number of securities in a continuous loss position 267 337 435
Fixed maturity securities | 20 To 50 percent below cost
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 279 445 1,413
Gross unrealized losses (140) [1] (218) [2] (683) [3]
Number of securities in a continuous loss position 98 128 310
Fixed maturity securities | 20 To 50 percent below cost | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 7 0 78
Gross unrealized losses (2) 0 (30)
Number of securities in a continuous loss position 6 0 27
Fixed maturity securities | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 272 445 1,335
Gross unrealized losses (138) [4] (218) [5] (653) [6]
Number of securities in a continuous loss position 92 128 283
Fixed maturity securities | Greater than 50% below cost
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 29 51 137
Gross unrealized losses (79) [1] (133) [2] (314) [3]
Number of securities in a continuous loss position 53 80 141
Fixed maturity securities | Greater than 50% below cost | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value    0 4
Gross unrealized losses    0 (14)
Number of securities in a continuous loss position    0 15
Fixed maturity securities | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 29 51 133
Gross unrealized losses (79) [4] (133) [5] (300) [6]
Number of securities in a continuous loss position 53 80 126
Fixed maturity securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 140 170  
Gross unrealized losses (71) (80)  
Number of securities in a continuous loss position 24 32  
Percentage of total gross unrealized losses for securities in a continuous loss position 14.00% 13.00%  
Fixed maturity securities | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2 5  
Gross unrealized losses (4) (8)  
Number of securities in a continuous loss position 7 9  
Percentage of total gross unrealized losses for securities in a continuous loss position 1.00% 1.00%  
Fixed maturity securities | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 132 275  
Gross unrealized losses (67) (138)  
Number of securities in a continuous loss position 68 96  
Percentage of total gross unrealized losses for securities in a continuous loss position 13.00% 22.00%  
Fixed maturity securities | Below investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 27 46  
Gross unrealized losses (75) (125)  
Number of securities in a continuous loss position 46 71  
Percentage of total gross unrealized losses for securities in a continuous loss position 15.00% 21.00%  
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 766 655 160
Gross unrealized losses (53) [1] (18) [2] (1) [3]
Number of securities in a continuous loss position 22 19 2
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 766 655 160
Gross unrealized losses (53) (18) (1)
Number of securities in a continuous loss position 22 19 2
Fixed maturity securities | U.S. government, agencies and government-sponsored enterprises | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value    0   
Gross unrealized losses    [4] 0 [5]    [6]
Number of securities in a continuous loss position    0   
Fixed maturity securities | Tax-exempt
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 112 137 230
Gross unrealized losses (21) [1] (30) [2] (76) [3]
Number of securities in a continuous loss position 10 13 72
Fixed maturity securities | Tax-exempt | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value    0   
Gross unrealized losses    0   
Number of securities in a continuous loss position    0   
Fixed maturity securities | Tax-exempt | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 112 137 230
Gross unrealized losses (21) [4] (30) [5] (76) [6]
Number of securities in a continuous loss position 10 13 72
Fixed maturity securities | Tax-exempt | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 16 31  
Gross unrealized losses (6) (10)  
Number of securities in a continuous loss position 2 3  
Percentage of total gross unrealized losses for securities in a continuous loss position 1.00% 2.00%  
Fixed maturity securities | Tax-exempt | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Fixed maturity securities | Government - non-U.S.
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 133 103 98
Gross unrealized losses (2) [1] (1) [2] (2) [3]
Number of securities in a continuous loss position 18 21 33
Fixed maturity securities | Government - non-U.S. | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 133 103 90
Gross unrealized losses (2) (1) (1)
Number of securities in a continuous loss position 18 21 25
Fixed maturity securities | Government - non-U.S. | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value    0 8
Gross unrealized losses    [4] 0 [5] (1) [6]
Number of securities in a continuous loss position    0 8
Fixed maturity securities | U.S. corporate
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2,108 1,505 3,137
Gross unrealized losses (111) [1] (104) [2] (326) [3]
Number of securities in a continuous loss position 258 219 311
Fixed maturity securities | U.S. corporate | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,579 859 1,721
Gross unrealized losses (50) (19) (68)
Number of securities in a continuous loss position 211 154 175
Fixed maturity securities | U.S. corporate | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 529 646 1,416
Gross unrealized losses (61) [4] (85) [5] (258) [6]
Number of securities in a continuous loss position 47 65 136
Fixed maturity securities | U.S. corporate | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 18 34  
Gross unrealized losses (5) (12)  
Number of securities in a continuous loss position 1 3  
Percentage of total gross unrealized losses for securities in a continuous loss position 1.00% 2.00%  
Fixed maturity securities | U.S. corporate | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Fixed maturity securities | U.S. corporate | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2 9  
Gross unrealized losses (1) (9)  
Number of securities in a continuous loss position 3 1  
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00% 1.00%  
Fixed maturity securities | U.S. corporate | Below investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Fixed maturity securities | Corporate - non-U.S.
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,425 1,101 2,180
Gross unrealized losses (39) [1] (47) [2] (218) [3]
Number of securities in a continuous loss position 158 146 263
Fixed maturity securities | Corporate - non-U.S. | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 1,184 665 1,475
Gross unrealized losses (17) (9) (86)
Number of securities in a continuous loss position 138 105 188
Fixed maturity securities | Corporate - non-U.S. | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 241 436 705
Gross unrealized losses (22) [4] (38) [5] (132) [6]
Number of securities in a continuous loss position 20 41 75
Fixed maturity securities | Corporate - non-U.S. | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 32 29  
Gross unrealized losses (15) (17)  
Number of securities in a continuous loss position 7 7  
Percentage of total gross unrealized losses for securities in a continuous loss position 3.00% 3.00%  
Fixed maturity securities | Corporate - non-U.S. | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Fixed maturity securities | Residential mortgage-backed
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 637 646 1,003
Gross unrealized losses (145) [1] (225) [2] (455) [3]
Number of securities in a continuous loss position 269 310 427
Fixed maturity securities | Residential mortgage-backed | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 277 152 276
Gross unrealized losses (2) (1) (5)
Number of securities in a continuous loss position 42 32 68
Fixed maturity securities | Residential mortgage-backed | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 360 494 727
Gross unrealized losses (143) [4] (224) [5] (450) [6]
Number of securities in a continuous loss position 227 278 359
Fixed maturity securities | Commercial mortgage-backed
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 705 932 1,113
Gross unrealized losses (57) [1] (103) [2] (231) [3]
Number of securities in a continuous loss position 115 150 208
Fixed maturity securities | Commercial mortgage-backed | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 172 183 282
Gross unrealized losses (2) (1) (36)
Number of securities in a continuous loss position 23 20 49
Fixed maturity securities | Commercial mortgage-backed | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 533 749 831
Gross unrealized losses (55) [4] (102) [5] (195) [6]
Number of securities in a continuous loss position 92 130 159
Fixed maturity securities | Other asset-backed
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 303 467 932
Gross unrealized losses (59) [1] (67) [2] (96) [3]
Number of securities in a continuous loss position 47 60 118
Fixed maturity securities | Other asset-backed | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 153 282 623
Gross unrealized losses (1) (1) (3)
Number of securities in a continuous loss position 31 42 83
Fixed maturity securities | Other asset-backed | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 150 185 309
Gross unrealized losses (58) [4] (66) [5] (93) [6]
Number of securities in a continuous loss position 16 18 35
Equity securities
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 55 66 117
Gross unrealized losses (3) [1] (6) [2] (14) [3]
Number of securities in a continuous loss position 53 45 52
Equity securities | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 43 52 92
Gross unrealized losses (2) (4) (11)
Number of securities in a continuous loss position 47 32 39
Equity securities | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 12 14 25
Gross unrealized losses (1) [4] (2) [5] (3) [6]
Number of securities in a continuous loss position 6 13 13
Equity securities | Less Than 20 Percent Below Cost
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 55 59 101
Gross unrealized losses (3) [1] (3) [2] (7) [3]
Number of securities in a continuous loss position 53 40 48
Equity securities | Less Than 20 Percent Below Cost | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 43 47 80
Gross unrealized losses (2) (2) (6)
Number of securities in a continuous loss position 47 29 36
Equity securities | Less Than 20 Percent Below Cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 12 12 21
Gross unrealized losses (1) [4] (1) [5] (1) [6]
Number of securities in a continuous loss position 6 11 12
Equity securities | 20 To 50 percent below cost
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value   7 16
Gross unrealized losses   (3) [2] (7) [3]
Number of securities in a continuous loss position   5 4
Equity securities | 20 To 50 percent below cost | Less Than Twelve Months
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value   5 12
Gross unrealized losses   (2) (5)
Number of securities in a continuous loss position   3 3
Equity securities | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value   2 4
Gross unrealized losses   (1) [5] (2) [6]
Number of securities in a continuous loss position   2 1
Structured Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 74 76  
Gross unrealized losses (45) (41)  
Number of securities in a continuous loss position 14 19  
Percentage of total gross unrealized losses for securities in a continuous loss position 9.00% 6.00%  
Structured Securities | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2 5  
Gross unrealized losses (4) (8)  
Number of securities in a continuous loss position 7 9  
Percentage of total gross unrealized losses for securities in a continuous loss position 1.00% 1.00%  
Structured Securities | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 130 266  
Gross unrealized losses (66) (129)  
Number of securities in a continuous loss position 65 95  
Percentage of total gross unrealized losses for securities in a continuous loss position 13.00% 21.00%  
Structured Securities | Below investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 27 46  
Gross unrealized losses (75) (125)  
Number of securities in a continuous loss position 46 71  
Percentage of total gross unrealized losses for securities in a continuous loss position 15.00% 21.00%  
Structured Securities | Residential mortgage-backed | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 21 28  
Gross unrealized losses (12) (15)  
Number of securities in a continuous loss position 9 12  
Percentage of total gross unrealized losses for securities in a continuous loss position 2.00% 2.00%  
Structured Securities | Residential mortgage-backed | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2 5  
Gross unrealized losses (3) (7)  
Number of securities in a continuous loss position 6 8  
Percentage of total gross unrealized losses for securities in a continuous loss position 1.00% 1.00%  
Structured Securities | Residential mortgage-backed | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 94 179  
Gross unrealized losses (44) (86)  
Number of securities in a continuous loss position 52 76  
Percentage of total gross unrealized losses for securities in a continuous loss position 9.00% 14.00%  
Structured Securities | Residential mortgage-backed | Below investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 18 32  
Gross unrealized losses (61) (96)  
Number of securities in a continuous loss position 41 62  
Percentage of total gross unrealized losses for securities in a continuous loss position 12.00% 16.00%  
Structured Securities | Commercial mortgage-backed | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2 15  
Gross unrealized losses (1) (5)  
Number of securities in a continuous loss position 2 5  
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00% 1.00%  
Structured Securities | Commercial mortgage-backed | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses (1) (1)  
Number of securities in a continuous loss position 1 1  
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Structured Securities | Commercial mortgage-backed | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 22 53  
Gross unrealized losses (12) (20)  
Number of securities in a continuous loss position 12 17  
Percentage of total gross unrealized losses for securities in a continuous loss position 2.00% 3.00%  
Structured Securities | Commercial mortgage-backed | Below investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 3 8  
Gross unrealized losses (4) (19)  
Number of securities in a continuous loss position 3 7  
Percentage of total gross unrealized losses for securities in a continuous loss position 1.00% 3.00%  
Structured Securities | Other asset-backed | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 51 33  
Gross unrealized losses (32) (21)  
Number of securities in a continuous loss position 3 2  
Percentage of total gross unrealized losses for securities in a continuous loss position 7.00% 3.00%  
Structured Securities | Other asset-backed | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Structured Securities | Other asset-backed | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 14 34  
Gross unrealized losses (10) (23)  
Number of securities in a continuous loss position 1 2  
Percentage of total gross unrealized losses for securities in a continuous loss position 2.00% 4.00%  
Structured Securities | Other asset-backed | Below investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 6 6  
Gross unrealized losses (10) (10)  
Number of securities in a continuous loss position 2 2  
Percentage of total gross unrealized losses for securities in a continuous loss position 2.00% 2.00%  
Corporate Debt Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 50 63  
Gross unrealized losses (20) (29)  
Number of securities in a continuous loss position 8 10  
Percentage of total gross unrealized losses for securities in a continuous loss position 4.00% 5.00%  
Corporate Debt Securities | Investment grade | 20 To 50 percent below cost | 12 Months Or More | Finance and insurance
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 50 63  
Gross unrealized losses (20) (29)  
Number of securities in a continuous loss position 8 10  
Percentage of total gross unrealized losses for securities in a continuous loss position 4.00% 5.00%  
Corporate Debt Securities | Investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Corporate Debt Securities | Investment grade | Greater than 50% below cost | 12 Months Or More | Finance and insurance
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Corporate Debt Securities | Below investment grade | 20 To 50 percent below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2 9  
Gross unrealized losses (1) (9)  
Number of securities in a continuous loss position 3 1  
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00% 1.00%  
Corporate Debt Securities | Below investment grade | 20 To 50 percent below cost | 12 Months Or More | Consumer-non-cyclical
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value   9  
Gross unrealized losses   (9)  
Number of securities in a continuous loss position   1  
Percentage of total gross unrealized losses for securities in a continuous loss position   1.00%  
Corporate Debt Securities | Below investment grade | 20 To 50 percent below cost | 12 Months Or More | Consumer-cyclical
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 2    
Gross unrealized losses (1)    
Number of securities in a continuous loss position 3    
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%    
Corporate Debt Securities | Below investment grade | Greater than 50% below cost | 12 Months Or More
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0     
Gross unrealized losses 0     
Number of securities in a continuous loss position 0     
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%     
Corporate Debt Securities | Below investment grade | Greater than 50% below cost | 12 Months Or More | Consumer-non-cyclical
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value       
Gross unrealized losses       
Number of securities in a continuous loss position       
Percentage of total gross unrealized losses for securities in a continuous loss position       
Corporate Debt Securities | Below investment grade | Greater than 50% below cost | 12 Months Or More | Consumer-cyclical
      
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]      
Fair value 0    
Gross unrealized losses $ 0    
Number of securities in a continuous loss position 0    
Percentage of total gross unrealized losses for securities in a continuous loss position 0.00%    
[1] Amounts included $76 million of unrealized losses on other-than-temporarily impaired securities.
[2] Amounts included $124 million of unrealized losses on other-than-temporarily impaired securities.
[3] Amounts included $257 million of unrealized losses on other-than-temporarily impaired securities.
[4] Amounts included $75 million of unrealized losses on other-than-temporarily impaired securities.
[5] Amounts included $123 million of unrealized losses on other-than-temporarily impaired securities.
[6] Amounts included $248 million of unrealized losses on other-than-temporarily impaired securities.
[7] Amounts that have been in a continuous loss position for 12 months or more included $74 million of unrealized losses on other-than-temporarily impaired securities.
[8] Amounts that have been in a continuous loss position for 12 months or more included $119 million of unrealized losses on other-than-temporarily impaired securities.
[9] Amounts that have been in a continuous loss position for 12 months or more included $235 million of unrealized losses on other-than-temporarily impaired securities.