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Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Valuation Technique Actuarial model [1]    
Minimum
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Significant Unobservable Inputs Lapse rate 1.00% [1]    
Significant Unobservable Inputs Annuitization rate 0.00% [1]    
Maximum
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Significant Unobservable Inputs Lapse rate 30.00% [1]    
Significant Unobservable Inputs Annuitization rate 55.00% [1]    
Guaranteed Minimum Income Benefit
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value $ 193 [1]    
Balance - beginning of year, liabilities 1,119 [2],[3] 1,319 [4] 507
Transfers Into Level 3, liabilities    [2] 0 0
Transfers out of Level 3, liabilities    [2] 0 0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities    [2] 0   
Net Realized Gains/Losses, Liabilities (926) [2] (200) (812)
Purchased, liabilities    [2] 0 0
Sales, liabilities    [2] 0 0
Settlements, liabilities    [2] 0 0
Balance - end of year, liabilities 193 [2] 1,119 [2],[3] 1,319 [4]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities (926) [2] (200) 812
Equity securities
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets 3 13 13
Transfers into Level 3, assets 8 2   
Transfers out of Level 3, assets (1) (11)   
Change in Net Unrealized Gains (Losses) included in OCI, Assets (6)    1
Net Realized Gains/Losses, Assets (4)    (4)
Purchased, assets 2 4 5
Sales, assets (6) (5) (8)
Settlements, assets         
Balance, end of year, assets 4 3 13
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets         
Short-term investments
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets       
Transfers into Level 3, assets 8    
Transfers out of Level 3, assets (2)    
Change in Net Unrealized Gains (Losses) included in OCI, Assets       
Net Realized Gains/Losses, Assets       
Purchased, assets 3    
Sales, assets (1)    
Settlements, assets (1)    
Balance, end of year, assets 7    
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets       
Other Long-term Investments [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets 2,252 1,877 1,432
Transfers into Level 3, assets    53   
Transfers out of Level 3, assets         
Change in Net Unrealized Gains (Losses) included in OCI, Assets 45 (55) (93)
Net Realized Gains/Losses, Assets 2 7 (3)
Purchased, assets 551 520 602
Sales, assets (10) (9) (55)
Settlements, assets (396) (237) (192)
Balance, end of year, assets 2,440 2,252 1,877
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 2 7 3
Other Derivative Instruments Fair Value [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets   3 4
Transfers into Level 3, assets   0 0
Transfers out of Level 3, assets   0   
Change in Net Unrealized Gains (Losses) included in OCI, Assets   0   
Net Realized Gains/Losses, Assets   4 (2)
Purchased, assets   3 0
Sales, assets   0   
Settlements, assets   (2) (3)
Balance, end of year, assets      3
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets   0 1
Fixed maturities available for sale | U.S. Treasury and agency
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets   5   
Transfers into Level 3, assets        
Transfers out of Level 3, assets   (4)   
Change in Net Unrealized Gains (Losses) included in OCI, Assets        
Net Realized Gains/Losses, Assets        
Purchased, assets      5
Sales, assets        
Settlements, assets   (1)   
Balance, end of year, assets      5
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets        
Fixed maturities available for sale | Foreign Government Debt Securities [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets 60 33 26
Transfers into Level 3, assets 36 49 9
Transfers out of Level 3, assets (54) (13) (18)
Change in Net Unrealized Gains (Losses) included in OCI, Assets    1 1
Net Realized Gains/Losses, Assets (1)    0
Purchased, assets 24 46 23
Sales, assets (21) (53) (3)
Settlements, assets (2) (1) (3)
Balance, end of year, assets 44 60 33
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets       0
Fixed maturities available for sale | Corporate securities
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets 102 134 115
Transfers into Level 3, assets 47 37 42
Transfers out of Level 3, assets (31) (46) (4)
Change in Net Unrealized Gains (Losses) included in OCI, Assets    (6) 2
Net Realized Gains/Losses, Assets 2 1 (3)
Purchased, assets 75 24 32
Sales, assets (7) (19) (27)
Settlements, assets (18) (33) (19)
Balance, end of year, assets 166 102 134
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 2    0
Fixed maturities available for sale | Mortgage backed-securities
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets 13 28 39
Transfers into Level 3, assets    22 4
Transfers out of Level 3, assets    (35) (48)
Change in Net Unrealized Gains (Losses) included in OCI, Assets         
Net Realized Gains/Losses, Assets         
Purchased, assets    9 59
Sales, assets (3) (7) (17)
Settlements, assets (2) (4) (9)
Balance, end of year, assets 8 13 28
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets        
Fixed maturities available for sale | States, municipalities, and political subdivisions
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of year, assets   1 2
Transfers into Level 3, assets   1   
Transfers out of Level 3, assets   (1)   
Change in Net Unrealized Gains (Losses) included in OCI, Assets        
Net Realized Gains/Losses, Assets        
Purchased, assets      0
Sales, assets        
Settlements, assets   (1) (1)
Balance, end of year, assets      1
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets        
[1] Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.
[2] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 c) for additional information.
[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets.
[4] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $1.5 billion at December 31, 2011 and $648 million at December 31, 2010, which includes a fair value derivative adjustment of $1.3 billion and $507 million, respectively.