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Investments (Available-For-Sale And Held-To-Maturity Securities In Consolidated Investment Portfolio) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost $ 4,623  
Fair Value 4,709  
Variable Interest Entity [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 2,826 2,829
Fair Value 2,759 2,674
Variable Interest Entity [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 408  
Fair Value 403  
Fair Value 2,759  
HTM Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 2,826 2,829
Gross Unrealized Gains 26 2
Gross Unrealized Losses (93) (157)
Fair Value 2,759 2,674
HTM Investments [Member] | Corporate Obligations [Member] | Variable Interest Entity [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 2,826 2,829
Gross Unrealized Gains 26 2
Gross Unrealized Losses (93) (157)
Fair Value 2,759 2,674
AFS Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 5,951 6,122
Gross Unrealized Gains 217 251
Gross Unrealized Losses (135) (152)
Fair Value 6,033 6,221
Other-Than-Temporary Impairments (15) [1] (20) [1]
AFS Investments [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 4,623 4,883
Gross Unrealized Gains 202 238
Gross Unrealized Losses (116) (128)
Fair Value 4,709 4,993
Other-Than-Temporary Impairments (15) [1] (20) [1]
AFS Investments [Member] | Corporate Obligations [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 994 1,058
Gross Unrealized Gains 45 54
Gross Unrealized Losses (20) (20)
Fair Value 1,019 1,092
Other-Than-Temporary Impairments 4 [1] 5 [1]
AFS Investments [Member] | Corporate Obligations [Member] | Variable Interest Entity [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 175 177
Gross Unrealized Gains 10 9
Gross Unrealized Losses (6) (6)
Fair Value 179 180
AFS Investments [Member] | U.S. Treasury And Government Agency [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 678 819
Gross Unrealized Gains 37 40
Gross Unrealized Losses (1) (1)
Fair Value 714 858
AFS Investments [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 1,457 1,446
Gross Unrealized Gains 76 97
Gross Unrealized Losses (8) (12)
Fair Value 1,525 1,531
AFS Investments [Member] | State And Municipal Bonds [Member] | Variable Interest Entity [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 33 38
Gross Unrealized Gains 4 3
Fair Value 37 41
AFS Investments [Member] | Foreign Governments [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 198 183
Gross Unrealized Gains 12 13
Fair Value 210 196
AFS Investments [Member] | Residential Mortgage-Backed Agency [Member] | Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 888 939
Gross Unrealized Gains 16 19
Gross Unrealized Losses (3) (1)
Fair Value 901 957
AFS Investments [Member] | Residential Mortgage-Backed Non-Agency [Member] | Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 78 86
Gross Unrealized Gains 11 11
Gross Unrealized Losses (7) (8)
Fair Value 82 89
Other-Than-Temporary Impairments 2 [1]  
AFS Investments [Member] | Residential Mortgage-Backed Non-Agency [Member] | Variable Interest Entity [Member] | Mortgage-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 86 92
Gross Unrealized Losses (7) (10)
Fair Value 79 82
AFS Investments [Member] | Commercial Mortgage-Backed [Member] | Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 31 46
Gross Unrealized Gains 1  
Gross Unrealized Losses (1) (4)
Fair Value 31 42
AFS Investments [Member] | Collateralized Debt Obligations [Member] | Asset-Backed Securities [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 158 161
Gross Unrealized Gains 1 1
Gross Unrealized Losses (65) (71)
Fair Value 94 91
Other-Than-Temporary Impairments (21) [1] (25) [1]
AFS Investments [Member] | Collateralized Debt Obligations [Member] | Variable Interest Entity [Member] | Asset-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 94 97
Gross Unrealized Losses (6) (8)
Fair Value 88 89
AFS Investments [Member] | Other Asset-Backed [Member] | Asset-Backed Securities [Member] | Fixed-Maturity Investments [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 141 145
Gross Unrealized Gains 3 3
Gross Unrealized Losses (11) (11)
Fair Value 133 137
AFS Investments [Member] | Other Asset-Backed [Member] | Variable Interest Entity [Member] | Asset-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 20 23
Fair Value 20 23
AFS Investments [Member] | Money Market Securities [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 688 580
Fair Value 688 580
AFS Investments [Member] | Money Market Securities [Member] | Variable Interest Entity [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 220 210
Fair Value 220 210
AFS Investments [Member] | Perpetual debt and equity securities [Member]
   
Schedule of Investments [Line Items]    
Amortized Cost 12 22
Gross Unrealized Gains 1 1
Fair Value $ 13 $ 23
[1] Represents unrealized gains or losses on other than temporarily impaired securities recognized in AOCI, which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in AOCI.