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Investments (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost$ 69,185,000,000 $ 69,185,000,000 $ 65,924,000,000
Gross unrealized gains7,387,000,000 7,387,000,000 4,295,000,000
Gross unrealized losses(939,000,000) (939,000,000) (1,160,000,000)
Gross unrealized OTTI(205,000,000) (205,000,000) (248,000,000)
Fair Value75,428,000,000 75,428,000,000 68,811,000,000
Available-for-sale Securities, Debt Maturities, Amortized Cost     
Subtotal - Amortized Cost69,054,000,000 69,054,000,000  
Available-for-sale Securities, Debt Maturities, Fair Value     
Subtotal - Fair Value75,291,000,000 75,291,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months4,788,000,000 4,788,000,000 8,200,000,000
Greater Than Twelve Months2,565,000,000 2,565,000,000 3,814,000,000
Continuous Unrealized Loss Position, Total7,353,000,000 7,353,000,000 12,014,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months347,000,000 347,000,000 534,000,000
Greater Than Twelve Months797,000,000 797,000,000 874,000,000
Gross Unrealized Losses and OTTI, Total1,144,000,000 1,144,000,000 1,408,000,000
Available For Sale Securities In Unrealized Loss Position Qualitative Disclosure Number Of Positions952 952 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  42,000,000114,000,000 
OTTI for AFS securities backed by pools of residential and commercial mortgages recognized in OCI  9,000,00025,000,000 
OTTI for AFS securities backed by pools of residential and commercial mortgages recognized in net income (loss)  33,000,00089,000,000 
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]     
Fair Value1,097,000,000 1,097,000,000 1,201,000,000
Gross Unrealized Losses612,000,000 612,000,000 632,000,000
Gross Unrealized OTTI156,000,000 156,000,000 190,000,000
Number of securities270 270 291
Decrease in gross AFS securities unrealized losses  264,000,000  
Changes in the amount of credit loss of OTTI recognized in net income (loss) [Roll Forward]     
Balance as of beginning of year340,000,000293,000,000319,000,000268,000,000 
Increases attributable to:     
Credit losses on securities for which an OTTI was not previously recognized11,000,0006,000,00040,000,0007,000,000 
Credit losses on securities for which an OTTI was previously recognized17,000,00014,000,00057,000,00053,000,000 
Decreases attributable to:     
Securities sold(6,000,000)(6,000,000)(54,000,000)(21,000,000) 
Balance as of end of year362,000,000307,000,000362,000,000307,000,000 
Other Than Temporary Impairments Credit Losses [Line Items]     
Amortized Cost829,000,000 829,000,000 719,000,000
Gross Unrealized Gains2,000,000 2,000,000 5,000,000
Gross Unrealized Losses and OTTI(198,000,000) (198,000,000) (207,000,000)
Fair Value633,000,000 633,000,000 517,000,000
OTTI in Credit Losses362,000,000307,000,000362,000,000307,000,000 
Largest mortgage loan concentration in geographic region33.00% 33.00% 30.00%
Current6,806,000,000 6,806,000,000 6,697,000,000
Sixty to ninety days past due26,000,000 26,000,000 8,000,000
Greater than ninety days past due68,000,000 68,000,000 40,000,000
Valuation allowance associated with impaired mortgage loans on real estate(22,000,000) (22,000,000)  
Unamortized premium (discount)15,000,000 15,000,000 20,000,000
Total carrying value6,893,000,000 6,893,000,000 6,752,000,000
Information about impaired mortgage loans on real estate     
Number of impaired mortgage loans on real estate10 10 9
Principal balance of impaired mortgage loans on real estate79,000,000 79,000,000 75,000,000
Valuation allowance associated with impaired mortgage loans on real estate(22,000,000) (22,000,000)  
Carrying value of impaired mortgage loans on real estate57,000,000 57,000,000 62,000,000
Average carrying value for impaired loans58,000,00061,000,00055,000,00053,000,000 
Interest income recognized on impaired mortgage loans on real estate002,000,0001,000,000 
Amount of interest income collected on impaired mortgage loans002,000,0001,000,000 
Financing Receivable Allowance For Credit Losses Roll Forward [Abstract]     
Balance as of beginning-of-year  13,000,000  
Additions  14,000,000  
Charge-offs  (5,000,000)  
Balance as of end-of-period22,000,000 22,000,000  
Mortgage Loans Credit Quality [Line Items]     
Principal amount of mortgage loans on real estate6,900,000,000 6,900,000,000 6,745,000,000
Percentage of total mortgage loans on real estate100.00% 100.00% 100.00%
Alternative investments [Abstract]     
Number of partnerships in alternative investment portfolio97 97 95
Realized gain (loss) related to certain investments     
Fixed maturity AFS securities, Gross gains17,000,00012,000,00084,000,00096,000,000 
Fixed maturity AFS securities, Gross losses(63,000,000)(61,000,000)(177,000,000)(174,000,000) 
Equity AFS securities, Gross gains03,000,00010,000,0009,000,000 
Equity AFS securities, Gross losses000(4,000,000) 
Gain (loss) on other investments(3,000,000)(2,000,000)1,000,000(33,000,000) 
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds5,000,00022,000,000(13,000,000)20,000,000 
Total realized gain (loss) related to certain investments(44,000,000)(26,000,000)(95,000,000)(86,000,000) 
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)(33,000,000)(54,000,000)(124,000,000)(145,000,000) 
Associated amortization of DAC, VOBA, DSI and DFEL8,000,0008,000,00030,000,00035,000,000 
Net OTTI recognized in net income (loss), pre-tax(25,000,000)(46,000,000)(94,000,000)(110,000,000) 
Portion of OTTI Recognized in OCI     
Gross OTTI recognized in OCI21,000,00062,000,00048,000,00084,000,000 
Change in DAC, VOBA, DSI and DFEL(4,000,000)(9,000,000)(9,000,000)(7,000,000) 
Net portion of OTTI recognized in OCI, pre-tax17,000,00053,000,00039,000,00077,000,000 
Carrying Value Of Payables For Collateral On Investments [Abstract]     
Collateral payable held for derivative investments2,593,000,000 2,593,000,000 800,000,000
Securities pledged under securities lending agreements198,000,000 198,000,000 199,000,000
Securities pledged under reverse repurchase agreements280,000,000 280,000,000 280,000,000
Securities pledged for Treasury Asset-Backed Securities Loan Facility ('TALF')184,000,000 184,000,000 280,000,000
Securities pledged for Federal Home Loan Bank of Indianapolis Securities ('FHLBI')600,000,000 600,000,000 100,000,000
Total payables for collateral on investments3,855,000,000 3,855,000,000 1,659,000,000
Fair Value Of Related Investments Or Collateral [Abstract]     
Collateral payable held for derivative investments2,593,000,000 2,593,000,000 800,000,000
Securities pledged under securities lending agreements191,000,000 191,000,000 192,000,000
Securities pledged under reverse repurchase agreements295,000,000 295,000,000 294,000,000
Securities pledged for Treasury Asset-Backed Securities Loan Facility ('TALF')211,000,000 211,000,000 318,000,000
Securities pledged for Federal Home Loan Bank of Indianapolis Securities ('FHLBI')1,037,000,000 1,037,000,000 115,000,000
Total payables for collateral on investments4,327,000,000 4,327,000,000 1,719,000,000
Percentage of the fair value of domestic securities obtained as collateral under securities lending agreements102.00% 102.00% 102.00%
Percentage of the fair value of foreign securities obtained as collateral under securities lending agreements105.00% 105.00% 105.00%
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements95.00% 95.00% 95.00%
Percentage of the fair value of TALF securities obtained as collateral under securities pledged for TALF90.00% 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% 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% 95.00%
Increase (decrease) in payables for collateral on investments     
Collateral payable held for derivative investments  1,793,000,0001,053,000,000 
Securities pledged under securities lending agreements  (1,000,000)(301,000,000) 
Securities pledged under reverse repurchase agreements  0(64,000,000) 
Securities pledged for TALF  (96,000,000)(28,000,000) 
Securities pledged for FHLBI  500,000,0000 
Total increase (decrease) in payables for collateral on investments  2,196,000,000660,000,000 
Investment commitments627,000,000 627,000,000  
Investment commitments for limited partnerships271,000,000 271,000,000  
Investment commitments for private placements194,000,000 194,000,000  
Investment commitments for mortgage loans on real estate162,000,000 162,000,000  
Fixed maturity securities [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)(33,000,000)(54,000,000)(124,000,000)(142,000,000) 
Fixed maturity securities [Member] | Corporate bonds [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)(3,000,000)(34,000,000)(9,000,000)(80,000,000) 
Fixed maturity securities [Member] | CMOs [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)(22,000,000)(16,000,000)(65,000,000)(52,000,000) 
Fixed maturity securities [Member] | ABS CDOs [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)00(1,000,000)(1,000,000) 
Fixed maturity securities [Member] | Hybrid and redeemable preferred securities [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)00(2,000,000)(5,000,000) 
Fixed maturity securities [Member] | CMBS [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)(8,000,000)(4,000,000)(47,000,000)(4,000,000) 
Fixed maturity securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost69,054,000,000 69,054,000,000 65,745,000,000
Gross unrealized gains7,371,000,000 7,371,000,000 4,270,000,000
Gross unrealized losses(929,000,000) (929,000,000) (1,153,000,000)
Gross unrealized OTTI(205,000,000) (205,000,000) (248,000,000)
Fair Value75,291,000,000 75,291,000,000 68,614,000,000
Available-for-sale Securities, Debt Maturities, Amortized Cost     
Due in one year or less2,330,000,000 2,330,000,000  
Due after one year through five years12,515,000,000 12,515,000,000  
Due after five years through ten years21,789,000,000 21,789,000,000  
Due after ten years22,517,000,000 22,517,000,000  
Subtotal - Amortized Cost59,151,000,000 59,151,000,000  
Available-for-sale Securities, Debt Maturities, Fair Value     
Due in one year or less2,369,000,000 2,369,000,000  
Due after one year through five years13,390,000,000 13,390,000,000  
Due after five years through ten years23,809,000,000 23,809,000,000  
Due after ten years25,494,000,000 25,494,000,000  
Subtotal - Fair Value65,062,000,000 65,062,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months4,757,000,000 4,757,000,000 8,140,000,000
Greater Than Twelve Months2,565,000,000 2,565,000,000 3,814,000,000
Continuous Unrealized Loss Position, Total7,322,000,000 7,322,000,000 11,954,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months337,000,000 337,000,000 527,000,000
Greater Than Twelve Months797,000,000 797,000,000 874,000,000
Gross Unrealized Losses and OTTI, Total1,134,000,000 1,134,000,000 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 cost52,926,000,000 52,926,000,000 48,863,000,000
Gross unrealized gains5,955,000,000 5,955,000,000 3,571,000,000
Gross unrealized losses(551,000,000) (551,000,000) (607,000,000)
Gross unrealized OTTI(67,000,000) (67,000,000) (87,000,000)
Fair Value58,263,000,000 58,263,000,000 51,740,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months3,576,000,000 3,576,000,000 5,271,000,000
Greater Than Twelve Months1,405,000,000 1,405,000,000 2,007,000,000
Continuous Unrealized Loss Position, Total4,981,000,000 4,981,000,000 7,278,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months184,000,000 184,000,000 297,000,000
Greater Than Twelve Months434,000,000 434,000,000 397,000,000
Gross Unrealized Losses and OTTI, Total618,000,000 618,000,000 694,000,000
Fixed maturity securities [Member] | U.S. government bonds [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost239,000,000 239,000,000 150,000,000
Gross unrealized gains47,000,000 47,000,000 17,000,000
Gross unrealized losses0 0 (2,000,000)
Gross unrealized OTTI0 0 0
Fair Value286,000,000 286,000,000 165,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months14,000,000 14,000,000 28,000,000
Greater Than Twelve Months2,000,000 2,000,000 2,000,000
Continuous Unrealized Loss Position, Total16,000,000 16,000,000 30,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months0 0 2,000,000
Greater Than Twelve Months0 0 0
Gross Unrealized Losses and OTTI, Total0 0 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 cost590,000,000 590,000,000 473,000,000
Gross unrealized gains53,000,000 53,000,000 38,000,000
Gross unrealized losses(1,000,000) (1,000,000) (3,000,000)
Gross unrealized OTTI0 0 0
Fair Value642,000,000 642,000,000 508,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months86,000,000 86,000,000 19,000,000
Greater Than Twelve Months0 0 9,000,000
Continuous Unrealized Loss Position, Total86,000,000 86,000,000 28,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months1,000,000 1,000,000 0
Greater Than Twelve Months0 0 3,000,000
Gross Unrealized Losses and OTTI, Total1,000,000 1,000,000 3,000,000
Fixed maturity securities [Member] | MBS [Member]
     
Available-for-sale Securities, Debt Maturities, Amortized Cost     
Subtotal - Amortized Cost9,772,000,000 9,772,000,000  
Available-for-sale Securities, Debt Maturities, Fair Value     
Subtotal - Fair Value10,118,000,000 10,118,000,000  
Fixed maturity securities [Member] | CMOs [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost5,001,000,000 5,001,000,000 5,693,000,000
Gross unrealized gains404,000,000 404,000,000 324,000,000
Gross unrealized losses(73,000,000) (73,000,000) (114,000,000)
Gross unrealized OTTI(124,000,000) (124,000,000) (146,000,000)
Fair Value5,208,000,000 5,208,000,000 5,757,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months573,000,000 573,000,000 465,000,000
Greater Than Twelve Months492,000,000 492,000,000 748,000,000
Continuous Unrealized Loss Position, Total1,065,000,000 1,065,000,000 1,213,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months107,000,000 107,000,000 121,000,000
Greater Than Twelve Months90,000,000 90,000,000 139,000,000
Gross Unrealized Losses and OTTI, Total197,000,000 197,000,000 260,000,000
Fixed maturity securities [Member] | MPTS [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost3,052,000,000 3,052,000,000 2,980,000,000
Gross unrealized gains188,000,000 188,000,000 106,000,000
Gross unrealized losses0 0 (5,000,000)
Gross unrealized OTTI0 0 0
Fair Value3,240,000,000 3,240,000,000 3,081,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months2,000,000 2,000,000 190,000,000
Greater Than Twelve Months1,000,000 1,000,000 2,000,000
Continuous Unrealized Loss Position, Total3,000,000 3,000,000 192,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months0 0 5,000,000
Greater Than Twelve Months0 0 0
Gross Unrealized Losses and OTTI, Total0 0 5,000,000
Fixed maturity securities [Member] | CMBS [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost1,719,000,000 1,719,000,000 2,144,000,000
Gross unrealized gains70,000,000 70,000,000 95,000,000
Gross unrealized losses(105,000,000) (105,000,000) (180,000,000)
Gross unrealized OTTI(14,000,000) (14,000,000) (6,000,000)
Fair Value1,670,000,000 1,670,000,000 2,053,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months221,000,000 221,000,000 75,000,000
Greater Than Twelve Months154,000,000 154,000,000 304,000,000
Continuous Unrealized Loss Position, Total375,000,000 375,000,000 379,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months21,000,000 21,000,000 8,000,000
Greater Than Twelve Months98,000,000 98,000,000 178,000,000
Gross Unrealized Losses and OTTI, Total119,000,000 119,000,000 186,000,000
Fixed maturity securities [Member] | ABS CDOs [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost131,000,000 131,000,000 174,000,000
Gross unrealized gains0 0 22,000,000
Gross unrealized losses(20,000,000) (20,000,000) (13,000,000)
Gross unrealized OTTI0 0 (9,000,000)
Fair Value111,000,000 111,000,000 174,000,000
Available-for-sale Securities, Debt Maturities, Amortized Cost     
Subtotal - Amortized Cost131,000,000 131,000,000  
Available-for-sale Securities, Debt Maturities, Fair Value     
Subtotal - Fair Value111,000,000 111,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months3,000,000 3,000,000 0
Greater Than Twelve Months87,000,000 87,000,000 147,000,000
Continuous Unrealized Loss Position, Total90,000,000 90,000,000 147,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months1,000,000 1,000,000 0
Greater Than Twelve Months19,000,000 19,000,000 22,000,000
Gross Unrealized Losses and OTTI, Total20,000,000 20,000,000 22,000,000
Fixed maturity securities [Member] | State and municipal bonds [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost3,407,000,000 3,407,000,000 3,222,000,000
Gross unrealized gains571,000,000 571,000,000 27,000,000
Gross unrealized losses(9,000,000) (9,000,000) (94,000,000)
Gross unrealized OTTI0 0 0
Fair Value3,969,000,000 3,969,000,000 3,155,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months5,000,000 5,000,000 1,889,000,000
Greater Than Twelve Months28,000,000 28,000,000 27,000,000
Continuous Unrealized Loss Position, Total33,000,000 33,000,000 1,916,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months0 0 84,000,000
Greater Than Twelve Months9,000,000 9,000,000 10,000,000
Gross Unrealized Losses and OTTI, Total9,000,000 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 cost1,317,000,000 1,317,000,000 1,476,000,000
Gross unrealized gains55,000,000 55,000,000 56,000,000
Gross unrealized losses(170,000,000) (170,000,000) (135,000,000)
Gross unrealized OTTI0 0 0
Fair Value1,202,000,000 1,202,000,000 1,397,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months277,000,000 277,000,000 203,000,000
Greater Than Twelve Months396,000,000 396,000,000 568,000,000
Continuous Unrealized Loss Position, Total673,000,000 673,000,000 771,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months23,000,000 23,000,000 10,000,000
Greater Than Twelve Months147,000,000 147,000,000 125,000,000
Gross Unrealized Losses and OTTI, Total170,000,000 170,000,000 135,000,000
Fixed maturity securities [Member] | Variable Interest Entities Fixed Maturity Securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost672,000,000 672,000,000 570,000,000
Gross unrealized gains28,000,000 28,000,000 14,000,000
Gross unrealized losses0 0 0
Gross unrealized OTTI0 0 0
Fair Value700,000,000 700,000,000 584,000,000
Equity securities [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)000(3,000,000) 
Equity securities [Member] | Other Financial Services Securities [Member]
     
OTTI Recognized in Net Income (Loss)     
Gross OTTI recognized in net income (loss)000(3,000,000) 
Equity securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost131,000,000 131,000,000 179,000,000
Gross unrealized gains16,000,000 16,000,000 25,000,000
Gross unrealized losses(10,000,000) (10,000,000) (7,000,000)
Gross unrealized OTTI0 0 0
Fair Value137,000,000 137,000,000 197,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months31,000,000 31,000,000 60,000,000
Greater Than Twelve Months0 0 0
Continuous Unrealized Loss Position, Total31,000,000 31,000,000 60,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months10,000,000 10,000,000 7,000,000
Greater Than Twelve Months0 0 0
Gross Unrealized Losses and OTTI, Total10,000,000 10,000,000 7,000,000
Equity securities [Member] | Banking Securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost2,000,000 2,000,000 61,000,000
Gross unrealized gains0 0 0
Gross unrealized losses(1,000,000) (1,000,000) (3,000,000)
Gross unrealized OTTI0 0 0
Fair Value1,000,000 1,000,000 58,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months    57,000,000
Greater Than Twelve Months    0
Continuous Unrealized Loss Position, Total    57,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months    3,000,000
Greater Than Twelve Months    0
Gross Unrealized Losses and OTTI, Total    3,000,000
Equity securities [Member] | Insurance Securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost29,000,000 29,000,000 33,000,000
Gross unrealized gains1,000,000 1,000,000 4,000,000
Gross unrealized losses(3,000,000) (3,000,000) 0
Gross unrealized OTTI0 0 0
Fair Value27,000,000 27,000,000 37,000,000
Equity securities [Member] | Other Financial Services Securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost17,000,000 17,000,000 18,000,000
Gross unrealized gains8,000,000 8,000,000 14,000,000
Gross unrealized losses0 0 0
Gross unrealized OTTI0 0 0
Fair Value25,000,000 25,000,000 32,000,000
Equity securities [Member] | Other securities [Member]
     
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities     
Amortized cost83,000,000 83,000,000 67,000,000
Gross unrealized gains7,000,000 7,000,000 7,000,000
Gross unrealized losses(6,000,000) (6,000,000) (4,000,000)
Gross unrealized OTTI0 0 0
Fair Value84,000,000 84,000,000 70,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months6,000,000 6,000,000 3,000,000
Greater Than Twelve Months0 0 0
Continuous Unrealized Loss Position, Total6,000,000 6,000,000 3,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months6,000,000 6,000,000 4,000,000
Greater Than Twelve Months0 0 0
Gross Unrealized Losses and OTTI, Total6,000,000 6,000,000 4,000,000
Corporate bonds [Member]
     
Evaluation Of Credit Losses [Line Items]     
Percentage of fair value rated as investment grade97.00% 97.00% 95.00%
Amortized cost of portfolio rated below investment grade2,300,000,000 2,300,000,000 2,600,000,000
Fair value of portfolio rated below investment grade2,100,000,000 2,100,000,000 2,400,000,000
OTTI securities recognized in net income (loss), Recovery percentage of amortized cost98.00%80.00%98.00%80.00% 
Corporate bonds [Member]
     
Changes in the amount of credit loss of OTTI recognized in net income (loss) [Roll Forward]     
Balance as of beginning of year    60,000,000
Decreases attributable to:     
Balance as of end of year46,000,000 46,000,000 60,000,000
Other Than Temporary Impairments Credit Losses [Line Items]     
Amortized Cost168,000,000 168,000,000 204,000,000
Gross Unrealized Gains1,000,000 1,000,000 3,000,000
Gross Unrealized Losses and OTTI(66,000,000) (66,000,000) (76,000,000)
Fair Value103,000,000 103,000,000 131,000,000
OTTI in Credit Losses46,000,000 46,000,000 60,000,000
MBS [Member]
     
Evaluation Of Credit Losses [Line Items]     
Projected default rate on existing delinquencies on MBS (low end of range)25.00% 25.00% 25.00%
Projected default rate on existing delinquencies on MBS (high end of range)100.00% 100.00% 100.00%
Severity of second lien loans100.00% 100.00% 100.00%
Severity of first lien loans30.00% 30.00% 30.00%
CMOs [Member]
     
Changes in the amount of credit loss of OTTI recognized in net income (loss) [Roll Forward]     
Balance as of beginning of year    258,000,000
Decreases attributable to:     
Balance as of end of year288,000,000 288,000,000 258,000,000
Other Than Temporary Impairments Credit Losses [Line Items]     
Amortized Cost640,000,000 640,000,000 509,000,000
Gross Unrealized Gains1,000,000 1,000,000 2,000,000
Gross Unrealized Losses and OTTI(118,000,000) (118,000,000) (126,000,000)
Fair Value523,000,000 523,000,000 385,000,000
OTTI in Credit Losses288,000,000 288,000,000 258,000,000
CMBS [Member]
     
Changes in the amount of credit loss of OTTI recognized in net income (loss) [Roll Forward]     
Balance as of beginning of year    1,000,000
Decreases attributable to:     
Balance as of end of year28,000,000 28,000,000 1,000,000
Other Than Temporary Impairments Credit Losses [Line Items]     
Amortized Cost21,000,000 21,000,000 6,000,000
Gross Unrealized Gains0 0 0
Gross Unrealized Losses and OTTI(14,000,000) (14,000,000) (5,000,000)
Fair Value7,000,000 7,000,000 1,000,000
OTTI in Credit Losses28,000,000 28,000,000 1,000,000
ABS CDOs [Member]
     
Evaluation Of Credit Losses [Line Items]     
Percentage of fair value rated as investment grade89.00% 89.00% 91.00%
Amortized cost of portfolio rated below investment grade25,000,000 25,000,000 24,000,000
Fair value of portfolio rated below investment grade13,000,000 13,000,000 16,000,000
OTTI securities recognized in net income (loss), Recovery percentage of amortized cost0.00%0.00%0.00%0.00% 
Banking Securities [Member]
     
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months1,000,000 1,000,000  
Greater Than Twelve Months0 0  
Continuous Unrealized Loss Position, Total1,000,000 1,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months1,000,000 1,000,000  
Greater Than Twelve Months0 0  
Gross Unrealized Losses and OTTI, Total1,000,000 1,000,000  
Insurance Securities [Member]
     
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value     
Less Than or Equal to Twelve Months24,000,000 24,000,000  
Greater Than Twelve Months0 0  
Continuous Unrealized Loss Position, Total24,000,000 24,000,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI     
Less Than or Equal to Twelve Months3,000,000 3,000,000  
Greater Than Twelve Months0 0  
Gross Unrealized Losses and OTTI, Total3,000,000 3,000,000  
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 Cost2,120,000,000 2,120,000,000 2,539,000,000
Fair Value1,650,000,000 1,650,000,000 2,006,000,000
Unrealized Loss(470,000,000) (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 Cost532,000,000 532,000,000 611,000,000
Fair Value399,000,000 399,000,000 410,000,000
Unrealized Loss(133,000,000) (133,000,000) (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 Cost2,652,000,000 2,652,000,000 3,150,000,000
Fair Value2,049,000,000 2,049,000,000 2,416,000,000
Unrealized Loss(603,000,000) (603,000,000) (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 Cost2,097,000,000 2,097,000,000 2,303,000,000
Fair Value1,627,000,000 1,627,000,000 1,776,000,000
Unrealized Loss(470,000,000) (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 Cost132,000,000 132,000,000 185,000,000
Fair Value67,000,000 67,000,000 76,000,000
Unrealized Loss(65,000,000) (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 Cost2,229,000,000 2,229,000,000 2,488,000,000
Fair Value1,694,000,000 1,694,000,000 1,852,000,000
Unrealized Loss(535,000,000) (535,000,000) (636,000,000)
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 Value444,000,000 444,000,000 170,000,000
Gross Unrealized Losses156,000,000 156,000,000 73,000,000
Gross Unrealized OTTI31,000,000 31,000,000 5,000,000
Number of securities82 82 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 Value2,000,000 2,000,000 60,000,000
Gross Unrealized Losses0 0 22,000,000
Gross Unrealized OTTI2,000,000 2,000,000 0
Number of securities5 5 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 Value21,000,000 21,000,000 42,000,000
Gross Unrealized Losses6,000,000 6,000,000 17,000,000
Gross Unrealized OTTI3,000,000 3,000,000 1,000,000
Number of securities9 9 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 Value630,000,000 630,000,000 929,000,000
Gross Unrealized Losses450,000,000 450,000,000 520,000,000
Gross Unrealized OTTI120,000,000 120,000,000 184,000,000
Number of securities174 174 224
Loan to value ratio less than sixty five [Member]
     
Mortgage Loans Credit Quality [Line Items]     
Principal amount of mortgage loans on real estate5,343,000,000 5,343,000,000 4,863,000,000
Percentage of total mortgage loans on real estate77.40% 77.40% 72.10%
Debt-service coverage ratio1.60 1.60 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 estate1,148,000,000 1,148,000,000 1,484,000,000
Percentage of total mortgage loans on real estate16.70% 16.70% 22.00%
Debt-service coverage ratio1.37 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 estate319,000,000 319,000,000 179,000,000
Percentage of total mortgage loans on real estate4.60% 4.60% 2.70%
Debt-service coverage ratio0.86 0.86 0.85
Loan to value ratio, greater than one hundred [Member]
     
Mortgage Loans Credit Quality [Line Items]     
Principal amount of mortgage loans on real estate90,000,000 90,000,000 219,000,000
Percentage of total mortgage loans on real estate1.30% 1.30% 3.20%
Debt-service coverage ratio0.26 0.26 1.06
Federal Home Loan Mortgage Corporation [Member]
     
Concentration Risk [Line Items]     
Fair value5,100,000,000 5,100,000,000 5,000,000,000
Concentration risk, percentage6.00% 6.00% 6.00%
Fannie Mae [Member]
     
Concentration Risk [Line Items]     
Fair value2,800,000,000 2,800,000,000 2,900,000,000
Concentration risk, percentage3.00% 3.00% 3.00%
Cmo Industry [Member]
     
Concentration Risk [Line Items]     
Fair value5,900,000,000 5,900,000,000 6,500,000,000
Concentration risk, percentage6.00% 6.00% 8.00%
Electric Industry [Member]
     
Concentration Risk [Line Items]     
Fair value$ 7,600,000,000 $ 7,600,000,000 $ 6,700,000,000
Concentration risk, percentage8.00% 8.00% 8.00%