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Investments (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost $ 69,796,000,000 $ 65,924,000,000  
Gross unrealized gains 7,585,000,000 4,295,000,000  
Gross unrealized losses (906,000,000) (1,160,000,000)  
Gross unrealized OTTI (203,000,000) (248,000,000)  
Fair Value 76,272,000,000 68,811,000,000  
Available-for-sale Securities, Debt Maturities, Amortized Cost      
Subtotal - Amortized Cost 69,661,000,000    
Available-for-sale Securities, Debt Maturities, Fair Value      
Subtotal - Fair Value 76,133,000,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 3,993,000,000 8,200,000,000  
Greater Than Twelve Months 2,490,000,000 3,814,000,000  
Continuous Unrealized Loss Position, Total 6,483,000,000 12,014,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 338,000,000 534,000,000  
Greater Than Twelve Months 771,000,000 874,000,000  
Gross Unrealized Losses and OTTI, Total 1,109,000,000 1,408,000,000  
Available For Sale Securities In Unrealized Loss Position Qualitative Disclosure Number Of Positions 897 1,237  
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]      
Total OTTI for AFS securities backed by pools of residential and commercial mortgages 135,000,000 163,000,000  
OTTI for AFS securities backed by pools of residential and commercial mortgages recognized in OCI (15,000,000) 19,000,000  
OTTI for AFS securities backed by pools of residential and commercial mortgages recognized in net income (loss) 150,000,000 144,000,000  
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]      
Fair Value 1,055,000,000 1,201,000,000  
Gross Unrealized Losses 625,000,000 632,000,000  
Gross Unrealized OTTI 155,000,000 190,000,000  
Number of securities 256 291  
Decrease in gross AFS securities unrealized losses 299,000,000    
Balance as of beginning of year 319,000,000 268,000,000 0
Cumulative effect from adoption of new accounting standards 0 0 31,000,000
Increases attributable to:      
Credit losses on securities for which an OTTI was not previously recognized 55,000,000 14,000,000 267,000,000
Credit losses on securities for which an OTTI was previously recognized 71,000,000 65,000,000 0
Decreases attributable to:      
Securities sold (55,000,000) (28,000,000) (30,000,000)
Balance as of end of year 390,000,000 319,000,000 268,000,000
Other Than Temporary Impairments Credit Losses [Line Items]      
Amortized Cost 876,000,000    
Gross Unrealized Gains 2,000,000    
Gross Unrealized Losses and OTTI (205,000,000)    
Fair Value 673,000,000    
OTTI in Credit Losses 390,000,000 319,000,000 268,000,000
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 2,675,000,000 2,596,000,000  
Portion of the market adjustment for losses that relate to trading securities still held 118,000,000 93,000,000 137,000,000
Largest mortgage loan concentration in geographic region 32.00% 30.00%  
Mortgage Loans On Real Estate Aging [Abstract]      
Current 6,858,000,000 6,697,000,000  
Sixty to ninety days past due 26,000,000 8,000,000  
Greater than ninety days past due 76,000,000 40,000,000  
Valuation allowance associated with impaired mortgage loans on real estate 31,000,000 13,000,000  
Unamortized premium (discount) 13,000,000 20,000,000  
Total carrying value 6,942,000,000 6,752,000,000  
Information about impaired mortgage loans on real estate      
Number of impaired mortgage loans on real estate 12 9  
Principal balance of impaired mortgage loans on real estate 100,000,000 75,000,000  
Valuation allowance associated with impaired mortgage loans on real estate 31,000,000 13,000,000  
Carrying value of impaired mortgage loans on real estate 69,000,000 62,000,000  
Average carrying value for impaired loans on real estate 57,000,000 54,000,000 33,000,000
Interest income recognized on impaired mortgage loans on real estate 2,000,000 3,000,000 1,000,000
Amount of interest income collected on impaired mortgage loans on real estate 2,000,000 3,000,000 1,000,000
Balance as of beginning-of-year (13,000,000)    
Balance as of end-of-period (31,000,000) (13,000,000)  
Mortgage Loans Credit Quality [Line Items]      
Principal amount of mortgage loans on real estate 6,960,000,000 6,745,000,000  
Percentage of total mortgage loans on real estate 100.00% 100.00%  
Alternative investments [Abstract]      
Number of partnerships in alternative investment portfolio 96 95  
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 4,763,000,000 4,661,000,000 4,292,000,000
Investment expense (111,000,000) (120,000,000) (114,000,000)
Net investment income 4,652,000,000 4,541,000,000 4,178,000,000
Realized gain (loss) related to certain investments      
Fixed maturity AFS securities, Gross gains 86,000,000 107,000,000 161,000,000
Fixed maturity AFS securities, Gross losses (227,000,000) (248,000,000) (709,000,000)
Equity AFS securities, Gross gains 12,000,000 9,000,000 6,000,000
Equity AFS securities, Gross losses 0 (3,000,000) (27,000,000)
Gain (loss) on other investments (9,000,000) (53,000,000) (130,000,000)
Associated amortization expense of DAC, VOBA, DSI and DFEL and changes in other contract holder funds (13,000,000) 8,000,000 161,000,000
Total realized gain (loss) related to certain investments (151,000,000) (180,000,000) (538,000,000)
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (153,000,000) (205,000,000) (597,000,000)
Associated amortization expense of DAC, VOBA, DSI and DFEL 35,000,000 53,000,000 205,000,000
Net OTTI recognized in net income (loss), pre-tax (118,000,000) (152,000,000) (392,000,000)
Portion of OTTI Recognized in OCI      
Gross OTTI recognized in OCI 58,000,000 98,000,000 357,000,000
Change in DAC, VOBA, DSI and DFEL (11,000,000) (10,000,000) (82,000,000)
Net portion of OTTI recognized in OCI, pre-tax 47,000,000 88,000,000 275,000,000
Evaluation Of Credit Losses [Line Items]      
Projected default rate on existing delinquencies on MBS (low end of range) 25.00% 25.00%  
Projected default rate on existing delinquencies on MBS (high end of range) 100.00% 100.00%  
Severity of second lien loans 100.00%    
Severity of first lien loans 30.00%    
Carrying Value Of Payables For Collateral On Investments [Abstract]      
Collateral payable held for derivative investments 2,980,000,000 800,000,000  
Securities pledged under securities lending agreements 200,000,000 199,000,000  
Securities pledged under reverse repurchase agreements 280,000,000 280,000,000  
Securities pledged for Treasury Asset-Backed Securities Loan Facility ('TALF') 173,000,000 280,000,000  
Securities pledged for Federal Home Loan Bank of Indianapolis Securities ('FHLBI') 100,000,000 100,000,000  
Total payables for collateral on investments 3,733,000,000 1,659,000,000  
Fair Value Of Related Investments Or Collateral [Abstract]      
Collateral payable held for derivative investments 2,980,000,000 800,000,000  
Securities pledged under securities lending agreements 193,000,000 192,000,000  
Securities pledged under reverse repurchase agreements 294,000,000 294,000,000  
Securities pledged for Treasury Asset-Backed Securities Loan Facility ('TALF') 199,000,000 318,000,000  
Securities pledged for Federal Home Loan Bank of Indianapolis Securities ('FHLBI') 142,000,000 110,000,000  
Total payables for collateral on investments 3,808,000,000 1,714,000,000  
Percentage of the fair value of domestic securities obtained as collateral under securities lending agreements 102.00% 102.00%  
Percentage of the fair value of foreign securities obtained as collateral under securities lending agreements 105.00% 105.00%  
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements 95.00% 95.00%  
Percentage of the fair value of TALF securities obtained as collateral under securities pledged for TALF 90.00% 90.00%  
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI (low end of range) 85.00% 85.00%  
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI (high end of range) 95.00% 95.00%  
Increase (decrease) in payables for collateral on investments      
Collateral payable held for derivative investments 2,180,000,000 183,000,000 (2,192,000,000)
Securities pledged under securities lending agreements 1,000,000 (302,000,000) 74,000,000
Securities pledged under reverse repurchase agreements 0 (64,000,000) (126,000,000)
Securities pledged for TALF (107,000,000) (65,000,000) 345,000,000
Securities pledged for FHLBI 0 0 100,000,000
Total increase (decrease) in payables for collateral on investments 2,074,000,000 (248,000,000) (1,799,000,000)
Investment commitments 541,000,000    
Investment commitments for limited partnerships 223,000,000    
Investment commitments for private placements 191,000,000    
Investment commitments for mortgage loans on real estate 117,000,000    
Federal Home Loan Mortgage Corporation [Member]
     
Concentration Risk [Line Items]      
Fair value 5,000,000,000 5,000,000,000  
Concentration risk, percentage 5.00% 6.00%  
Fannie Mae [Member]
     
Concentration Risk [Line Items]      
Fair value 2,600,000,000 2,900,000,000  
Concentration risk, percentage 3.00% 3.00%  
Cmo Industry [Member]
     
Concentration Risk [Line Items]      
Fair value 5,600,000,000 6,500,000,000  
Concentration risk, percentage 6.00% 8.00%  
Electric Industry [Member]
     
Concentration Risk [Line Items]      
Fair value 7,700,000,000 6,700,000,000  
Concentration risk, percentage 8.00% 8.00%  
Corporate bonds [Member]
     
Evaluation Of Credit Losses [Line Items]      
OTTI securities recognized in net income (loss), Recovery percentage of amortized cost 98.00% 80.00%  
Corporate bonds [Member] | External Credit Rating, Investment Grade [Member]
     
Evaluation Of Credit Losses [Line Items]      
Percentage of fair value rated as investment grade 96.00% 95.00%  
Corporate bonds [Member] | External Credit Rating, Non Investment Grade [Member]
     
Evaluation Of Credit Losses [Line Items]      
Amortized cost of portfolio rated below investment grade 2,600,000,000 2,600,000,000  
Fair value of portfolio rated below investment grade 2,400,000,000 2,400,000,000  
CDOs [Member]
     
Evaluation Of Credit Losses [Line Items]      
OTTI securities recognized in net income (loss), Recovery percentage of amortized cost 0.00% 0.00%  
CDOs [Member] | External Credit Rating, Investment Grade [Member]
     
Evaluation Of Credit Losses [Line Items]      
Percentage of fair value rated as investment grade 97.00% 91.00%  
CDOs [Member] | External Credit Rating, Non Investment Grade [Member]
     
Evaluation Of Credit Losses [Line Items]      
Amortized cost of portfolio rated below investment grade 3,000,000 24,000,000  
Fair value of portfolio rated below investment grade 3,000,000 16,000,000  
Fixed maturity securities [Member]
     
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (153,000,000) (202,000,000) (570,000,000)
Fixed maturity securities [Member] | Corporate bonds [Member]
     
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (14,000,000) (90,000,000) (214,000,000)
Fixed maturity securities [Member] | CDOs [Member]
     
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (1,000,000) (1,000,000) (39,000,000)
Fixed maturity securities [Member] | Hybrid and redeemable preferred securities [Member]
     
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (2,000,000) (5,000,000) (67,000,000)
Fixed maturity securities [Member] | CMBS [Member]
     
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (57,000,000) (41,000,000) 0
Fixed maturity securities [Member] | RMBS [Member]
     
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (79,000,000) (65,000,000) (250,000,000)
Equity securities [Member]
     
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) 0 (3,000,000) (27,000,000)
Fixed maturity AFS securities [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 3,842,000,000 3,694,000,000 3,474,000,000
Equity AFS securities [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 5,000,000 6,000,000 8,000,000
Trading securities [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 154,000,000 157,000,000 159,000,000
Mortgage loans on real estate [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 408,000,000 424,000,000 462,000,000
Real estate [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 22,000,000 24,000,000 18,000,000
Standby Real Estate Equity Commitments [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 1,000,000 1,000,000 1,000,000
Policy loans [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 165,000,000 169,000,000 172,000,000
Invested cash [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 4,000,000 7,000,000 15,000,000
Commercial mortgage loan prepayment and bond makewhole premiums [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 82,000,000 67,000,000 24,000,000
Alternative investments [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 90,000,000 93,000,000 (55,000,000)
Consent fees [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 3,000,000 8,000,000 5,000,000
Other investments [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income (27,000,000) (3,000,000) 9,000,000
VIEs' fixed maturity securities [Member]
     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Investment income 14,000,000 14,000,000 0
Loan to value ratio less than sixty five [Member]
     
Mortgage Loans Credit Quality [Line Items]      
Principal amount of mortgage loans on real estate 5,338,000,000 4,863,000,000  
Percentage of total mortgage loans on real estate 76.70% 72.10%  
Debt-service coverage ratio 1.61 1.62  
Loan to value ratio sixty five to seventy four [Member]
     
Mortgage Loans Credit Quality [Line Items]      
Principal amount of mortgage loans on real estate 1,198,000,000 1,484,000,000  
Percentage of total mortgage loans on real estate 17.20% 22.00%  
Debt-service coverage ratio 1.37 1.40  
Loan to value ratio seventy five to one hundred [Member]
     
Mortgage Loans Credit Quality [Line Items]      
Principal amount of mortgage loans on real estate 308,000,000 179,000,000  
Percentage of total mortgage loans on real estate 4.40% 2.70%  
Debt-service coverage ratio 0.92 0.85  
Loan to value ratio, greater than one hundred [Member]
     
Mortgage Loans Credit Quality [Line Items]      
Principal amount of mortgage loans on real estate 116,000,000 219,000,000  
Percentage of total mortgage loans on real estate 1.70% 3.20%  
Debt-service coverage ratio 0.36 1.06  
Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 2,673,000,000 2,594,000,000  
Equity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 2,000,000 2,000,000  
Corporate bonds [Member]
     
Decreases attributable to:      
Balance as of end of year 51,000,000    
Other Than Temporary Impairments Credit Losses [Line Items]      
Amortized Cost 169,000,000    
Gross Unrealized Gains 1,000,000    
Gross Unrealized Losses and OTTI (67,000,000)    
Fair Value 103,000,000    
OTTI in Credit Losses 51,000,000    
CMBS [Member]
     
Decreases attributable to:      
Balance as of end of year 38,000,000    
Other Than Temporary Impairments Credit Losses [Line Items]      
Amortized Cost 17,000,000    
Gross Unrealized Gains 0    
Gross Unrealized Losses and OTTI (10,000,000)    
Fair Value 7,000,000    
OTTI in Credit Losses 38,000,000    
RMBS [Member]
     
Decreases attributable to:      
Balance as of end of year 301,000,000    
Other Than Temporary Impairments Credit Losses [Line Items]      
Amortized Cost 690,000,000    
Gross Unrealized Gains 1,000,000    
Gross Unrealized Losses and OTTI (128,000,000)    
Fair Value 563,000,000    
OTTI in Credit Losses 301,000,000    
Available For Sale Securities Continuous Unrealized Loss Position Less Than 6 Months [Member]
     
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]      
Fair Value 385,000,000 170,000,000  
Gross Unrealized Losses 125,000,000 73,000,000  
Gross Unrealized OTTI 31,000,000 5,000,000  
Number of securities 56 41  
Available For Sale Securities Continuous Unrealized Loss Position More Than 6 Months And Less Than 9 Months [Member]
     
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]      
Fair Value 53,000,000 60,000,000  
Gross Unrealized Losses 30,000,000 22,000,000  
Gross Unrealized OTTI 12,000,000 0  
Number of securities 18 13  
Available For Sale Securities Continuous Unrealized Loss Position More Than 9 Months And Less Than 12 Months [Member]
     
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]      
Fair Value 2,000,000 42,000,000  
Gross Unrealized Losses 0 17,000,000  
Gross Unrealized OTTI 1,000,000 1,000,000  
Number of securities 7 13  
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer [Member]
     
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]      
Fair Value 615,000,000 929,000,000  
Gross Unrealized Losses 470,000,000 520,000,000  
Gross Unrealized OTTI 111,000,000 184,000,000  
Number of securities 175 224  
Total Available For Sale Securities Backed By Pools Of Residential Mortgages At Risk [Member]
     
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]      
Amortized Cost 2,023,000,000 2,539,000,000  
Fair Value 1,553,000,000 2,006,000,000  
Unrealized Loss (470,000,000) (533,000,000)  
Total Available For Sale Securities Backed By Pools Of Commercial Mortgages At Risk [Member]
     
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]      
Amortized Cost 472,000,000 611,000,000  
Fair Value 344,000,000 410,000,000  
Unrealized Loss (128,000,000) (201,000,000)  
Total Available For Sale Securities Backed By Pools Of Residential And Commercial Mortgages At Risk [Member]
     
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]      
Amortized Cost 2,495,000,000 3,150,000,000  
Fair Value 1,897,000,000 2,416,000,000  
Unrealized Loss (598,000,000) (734,000,000)  
Available For Sale Securities Backed By Pools Of Residential Mortgages Subject To Detailed Analysis [Member]
     
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]      
Amortized Cost 2,015,000,000 2,303,000,000  
Fair Value 1,545,000,000 1,776,000,000  
Unrealized Loss (470,000,000) (527,000,000)  
Available For Sale Securities Backed By Pools Of Commercial Mortgages Subject To Detailed Analysis [Member]
     
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]      
Amortized Cost 126,000,000 185,000,000  
Fair Value 61,000,000 76,000,000  
Unrealized Loss (65,000,000) (109,000,000)  
Available For Sale Securities Backed By Pools Of Residential And Commercial Mortgages Subject To Detailed Analysis [Member]
     
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]      
Amortized Cost 2,141,000,000 2,488,000,000  
Fair Value 1,606,000,000 1,852,000,000  
Unrealized Loss (535,000,000) (636,000,000)  
Corporate bonds [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 1,908,000,000 1,801,000,000  
U.S. government bonds [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 376,000,000 362,000,000  
Foreign government bonds [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 39,000,000 29,000,000  
RMBS [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 244,000,000 255,000,000  
CDOs [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 4,000,000 5,000,000  
State and municipal bonds [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 26,000,000 24,000,000  
Hybrid and redeemable preferred securities [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 45,000,000 51,000,000  
CMBS [Member] | Fixed maturity securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of trading securities 31,000,000 67,000,000  
Fixed maturity securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 69,661,000,000 65,745,000,000  
Gross unrealized gains 7,569,000,000 4,270,000,000  
Gross unrealized losses (894,000,000) (1,153,000,000)  
Gross unrealized OTTI (203,000,000) (248,000,000)  
Fair Value 76,133,000,000 68,614,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 3,955,000,000 8,140,000,000  
Greater Than Twelve Months 2,490,000,000 3,814,000,000  
Continuous Unrealized Loss Position, Total 6,445,000,000 11,954,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 326,000,000 527,000,000  
Greater Than Twelve Months 771,000,000 874,000,000  
Gross Unrealized Losses and OTTI, Total 1,097,000,000 1,401,000,000  
Fixed maturity securities [Member] | Corporate bonds [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 53,661,000,000 48,863,000,000  
Gross unrealized gains 6,185,000,000 3,571,000,000  
Gross unrealized losses (517,000,000) (607,000,000)  
Gross unrealized OTTI (68,000,000) (87,000,000)  
Fair Value 59,261,000,000 51,740,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 2,848,000,000 5,271,000,000  
Greater Than Twelve Months 1,452,000,000 2,007,000,000  
Continuous Unrealized Loss Position, Total 4,300,000,000 7,278,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 162,000,000 297,000,000  
Greater Than Twelve Months 423,000,000 397,000,000  
Gross Unrealized Losses and OTTI, Total 585,000,000 694,000,000  
Fixed maturity securities [Member] | U.S. government bonds [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 439,000,000 150,000,000  
Gross unrealized gains 55,000,000 17,000,000  
Gross unrealized losses 0 (2,000,000)  
Gross unrealized OTTI 0 0  
Fair Value 494,000,000 165,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months   28,000,000  
Greater Than Twelve Months   2,000,000  
Continuous Unrealized Loss Position, Total   30,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months   2,000,000  
Greater Than Twelve Months   0  
Gross Unrealized Losses and OTTI, Total   2,000,000  
Fixed maturity securities [Member] | Foreign government bonds [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 668,000,000 473,000,000  
Gross unrealized gains 65,000,000 38,000,000  
Gross unrealized losses 0 (3,000,000)  
Gross unrealized OTTI 0 0  
Fair Value 733,000,000 508,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months   19,000,000  
Greater Than Twelve Months   9,000,000  
Continuous Unrealized Loss Position, Total   28,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months   0  
Greater Than Twelve Months   3,000,000  
Gross Unrealized Losses and OTTI, Total   3,000,000  
Fixed maturity securities [Member] | RMBS [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 7,690,000,000 8,673,000,000  
Gross unrealized gains 548,000,000 430,000,000  
Gross unrealized losses (73,000,000) (119,000,000)  
Gross unrealized OTTI (126,000,000) (146,000,000)  
Fair Value 8,039,000,000 8,838,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 565,000,000 655,000,000  
Greater Than Twelve Months 429,000,000 750,000,000  
Continuous Unrealized Loss Position, Total 994,000,000 1,405,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 125,000,000 126,000,000  
Greater Than Twelve Months 74,000,000 139,000,000  
Gross Unrealized Losses and OTTI, Total 199,000,000 265,000,000  
Fixed maturity securities [Member] | MBS [Member]
     
Available-for-sale Securities, Debt Maturities, Amortized Cost      
Subtotal - Amortized Cost 9,332,000,000    
Available-for-sale Securities, Debt Maturities, Fair Value      
Subtotal - Fair Value 9,639,000,000    
Fixed maturity securities [Member] | CDOs [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 121,000,000 174,000,000  
Gross unrealized gains 0 22,000,000  
Gross unrealized losses (19,000,000) (13,000,000)  
Gross unrealized OTTI 0 (9,000,000)  
Fair Value 102,000,000 174,000,000  
Available-for-sale Securities, Debt Maturities, Amortized Cost      
Subtotal - Amortized Cost 121,000,000    
Available-for-sale Securities, Debt Maturities, Fair Value      
Subtotal - Fair Value 102,000,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 9,000,000 0  
Greater Than Twelve Months 80,000,000 147,000,000  
Continuous Unrealized Loss Position, Total 89,000,000 147,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 1,000,000 0  
Greater Than Twelve Months 18,000,000 22,000,000  
Gross Unrealized Losses and OTTI, Total 19,000,000 22,000,000  
Fixed maturity securities [Member] | Fixed Maturity Securities Other Than Mortgage Backed Securities And Collateralized Debt Obligations [Member]
     
Available-for-sale Securities, Debt Maturities, Amortized Cost      
Due in one year or less 2,342,000,000    
Due after one year through five years 12,418,000,000    
Due after five years through ten years 22,456,000,000    
Due after ten years 22,992,000,000    
Subtotal - Amortized Cost 60,208,000,000    
Available-for-sale Securities, Debt Maturities, Fair Value      
Due in one year or less 2,378,000,000    
Due after one year through five years 13,288,000,000    
Due after five years through ten years 24,593,000,000    
Due after ten years 26,133,000,000    
Subtotal - Fair Value 66,392,000,000    
Fixed maturity securities [Member] | State and municipal bonds [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 3,490,000,000 3,222,000,000  
Gross unrealized gains 566,000,000 27,000,000  
Gross unrealized losses (9,000,000) (94,000,000)  
Gross unrealized OTTI 0 0  
Fair Value 4,047,000,000 3,155,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 31,000,000 1,889,000,000  
Greater Than Twelve Months 30,000,000 27,000,000  
Continuous Unrealized Loss Position, Total 61,000,000 1,916,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 0 84,000,000  
Greater Than Twelve Months 9,000,000 10,000,000  
Gross Unrealized Losses and OTTI, Total 9,000,000 94,000,000  
Fixed maturity securities [Member] | Hybrid and redeemable preferred securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 1,277,000,000 1,476,000,000  
Gross unrealized gains 50,000,000 56,000,000  
Gross unrealized losses (170,000,000) (135,000,000)  
Gross unrealized OTTI 0 0  
Fair Value 1,157,000,000 1,397,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 324,000,000 203,000,000  
Greater Than Twelve Months 353,000,000 568,000,000  
Continuous Unrealized Loss Position, Total 677,000,000 771,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 23,000,000 10,000,000  
Greater Than Twelve Months 147,000,000 125,000,000  
Gross Unrealized Losses and OTTI, Total 170,000,000 135,000,000  
Fixed maturity securities [Member] | VIEs' fixed maturity securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 673,000,000 570,000,000  
Gross unrealized gains 27,000,000 14,000,000  
Gross unrealized losses 0 0  
Gross unrealized OTTI 0 0  
Fair Value 700,000,000 584,000,000  
Fixed maturity securities [Member] | CMBS [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 1,642,000,000 2,144,000,000  
Gross unrealized gains 73,000,000 95,000,000  
Gross unrealized losses (106,000,000) (180,000,000)  
Gross unrealized OTTI (9,000,000) (6,000,000)  
Fair Value 1,600,000,000 2,053,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 178,000,000 75,000,000  
Greater Than Twelve Months 146,000,000 304,000,000  
Continuous Unrealized Loss Position, Total 324,000,000 379,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 15,000,000 8,000,000  
Greater Than Twelve Months 100,000,000 178,000,000  
Gross Unrealized Losses and OTTI, Total 115,000,000 186,000,000  
Equity securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities      
Amortized cost 135,000,000 179,000,000  
Gross unrealized gains 16,000,000 25,000,000  
Gross unrealized losses (12,000,000) (7,000,000)  
Gross unrealized OTTI 0 0  
Fair Value 139,000,000 197,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Less Than or Equal to Twelve Months 38,000,000 60,000,000  
Greater Than Twelve Months 0 0  
Continuous Unrealized Loss Position, Total 38,000,000 60,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI      
Less Than or Equal to Twelve Months 12,000,000 7,000,000  
Greater Than Twelve Months 0 0  
Gross Unrealized Losses and OTTI, Total $ 12,000,000 $ 7,000,000