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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
US Treasury And Government [Member] | Debt Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period$ 0 $ 0 
Included In Earnings    
Realized investment gains (losses), net0 0 
Asset management fees and other income0 0 
Included in other comprehensive income (loss)0 0 
Net investment income0 0 
Purchases66 66 
Sales0 0 
Issuances0 0 
Settlements0 0 
Foreign currency translation0 0 
Other0 0 
Transfers into Level 30 0 
Transfers out of Level 30 0 
Fair Value, end of period66 66 
Included In Earnings    
Realized investment gains (losses), net0 0 
Asset management fees and other income0 0 
Included in other comprehensive income (loss)0 0 
Foreign Government Debt Securities [Member] | Debt Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period27452747
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0000
Included in other comprehensive income (loss) 302
Net investment income0000
Purchases, sales, issuances and settlements 0 0
Purchases0 0 
Sales0 0 
Issuances0 0 
Settlements0 0 
Foreign currency translation0000
Other0000
Transfers into Level 300[1],[2]00
Transfers out of Level 30(16)[1],[2]0(17)[1]
Fair Value, end of period27322732
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0000
Included in other comprehensive income (loss)03[2]02
Corporate Securities [Member] | Debt Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period1,2788431,187902
Included In Earnings    
Realized investment gains (losses), net(6)(4)(33)(27)
Asset management fees and other income0000
Included in other comprehensive income (loss)(10)21(12)82
Net investment income2289
Purchases, sales, issuances and settlements (116) (253)
Purchases11 435 
Sales(24) (89) 
Issuances28 32 
Settlements(40) (278) 
Foreign currency translation71100
Other00146[3],[4]9[4]
Transfers into Level 349[1]32[1],[2]234[1],[2]162[1]
Transfers out of Level 3(87)[1](42)[1],[2](432)[1],[2](147)[1]
Fair Value, end of period1,2087371,208737
Included In Earnings    
Realized investment gains (losses), net(3)[2](8)[2](39)[2](30)[2]
Asset management fees and other income0000
Included in other comprehensive income (loss)(9)26[2](6)[2]91
Asset-backed Securities [Member] | Debt Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period2,9331,2441,7536,363
Included In Earnings    
Realized investment gains (losses), net6432(55)
Asset management fees and other income0000
Included in other comprehensive income (loss)(34)280126
Net investment income5620(25)
Purchases, sales, issuances and settlements 456 202
Purchases234 1,239 
Sales(80) (413) 
Issuances0 0 
Settlements(100) (237) 
Foreign currency translation488641
Other00502[3],[4]1[4]
Transfers into Level 317[1]0250[1],[2]129[1]
Transfers out of Level 3(298)[1](63)[1],[2](479)[1],[2](5,059)[1]
Fair Value, end of period2,7311,6832,7311,683
Included In Earnings    
Realized investment gains (losses), net2[2]3[2]6[2](67)[2]
Asset management fees and other income0000
Included in other comprehensive income (loss)(33)28[2]10[2]115
Commercial Mortgage Backed Securities [Member] | Debt Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period105170130305
Included In Earnings    
Realized investment gains (losses), net04(35)(128)
Asset management fees and other income0000
Included in other comprehensive income (loss)(8)0737
Net investment income(3)12(1)
Purchases, sales, issuances and settlements (37) (46)
Purchases0 5 
Sales(4) (20) 
Issuances0 0 
Settlements(3) (36) 
Foreign currency translation61192
Other0031[3],[4]48[4]
Transfers into Level 35[1](3)[1],[2]5[1],[2]8[1]
Transfers out of Level 3(5)[1](3)[1],[2](5)[1],[2](82)[1]
Fair Value, end of period9314393143
Included In Earnings    
Realized investment gains (losses), net1[2]0(40)[2](133)[2]
Asset management fees and other income0000
Included in other comprehensive income (loss)(9)3[2]15[2]39
Residential Mortgage Backed Securities [Member] | Debt Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period202523104
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0000
Included in other comprehensive income (loss)(1)0(1)0
Net investment income0000
Purchases, sales, issuances and settlements (1) (4)
Purchases1 1 
Sales(1) (1) 
Issuances0 0 
Settlements1 (1) 
Foreign currency translation0000
Other00(1)[4](48)[4]
Transfers into Level 30002[1]
Transfers out of Level 3000(30)[1]
Fair Value, end of period20242024
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0000
Included in other comprehensive income (loss)0000
Commercial Mortgage Loans [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period144296212338
Included In Earnings    
Realized investment gains (losses), net9131520
Asset management fees and other income0000
Included in other comprehensive income (loss)0000
Net investment income0000
Purchases, sales, issuances and settlements (1) (50)
Purchases0 0 
Sales0 0 
Issuances0 0 
Settlements(57) (131) 
Foreign currency translation0000
Other0000
Transfers into Level 30000
Transfers out of Level 30000
Fair Value, end of period9630896308
Included In Earnings    
Realized investment gains (losses), net8[2]13[2]15[2]20[2]
Asset management fees and other income0000
Included in other comprehensive income (loss)0000
Other Long-term Investments [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period1,230763768498
Included In Earnings    
Realized investment gains (losses), net1(7)5(10)
Asset management fees and other income(12)(1)5539
Included in other comprehensive income (loss)0000
Net investment income(11)1(10)2
Purchases, sales, issuances and settlements 0 227
Purchases103 236 
Sales(1) (7) 
Issuances0 0 
Settlements(1) (8) 
Foreign currency translation90120
Other00267[3]0
Transfers into Level 30000
Transfers out of Level 30000
Fair Value, end of period1,3187561,318756
Included In Earnings    
Realized investment gains (losses), net0(7)[2]2[2](10)[2]
Asset management fees and other income(20)16[2]16[2]36[2]
Included in other comprehensive income (loss)0000
US Treasury And Government [Member] | Trading Account Assets Supporting Insurance Liabilities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period0 0 
Included In Earnings    
Realized investment gains (losses), net0 0 
Asset management fees and other income0 0 
Net investment income0 0 
Purchases9 9 
Sales0 0 
Issuances0 0 
Settlements0 0 
Foreign currency translation0 0 
Other0 0 
Transfers into Level 30 0 
Transfers out of Level 30 0 
Fair Value, end of period9 9 
Included In Earnings    
Realized investment gains (losses), net0 0 
Asset management fees and other income0 0 
Corporate Securities [Member] | Trading Account Assets Supporting Insurance Liabilities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period84688283
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(1)(2)(2)(5)
Net investment income0001
Purchases, sales, issuances and settlements (21) (38)
Purchases0 49 
Sales0 (11) 
Issuances0 1 
Settlements(4) (35) 
Foreign currency translation0 0 
Other000 
Transfers into Level 315[1],[2]025[1]37[1],[2]
Transfers out of Level 3(2)[1],[2](3)[1](17)[1](36)[1],[2]
Fair Value, end of period92429242
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(2)[2](2)[2](2)[2](6)[2]
Asset-backed Securities [Member] | Trading Account Assets Supporting Insurance Liabilities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period410113226281
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(4)301
Net investment income1030
Purchases, sales, issuances and settlements 73 127
Purchases16 269 
Sales0 (23) 
Issuances0 0 
Settlements(35) (82) 
Foreign currency translation0 0 
Other0015[3] 
Transfers into Level 30009[1],[2]
Transfers out of Level 3(38)[1],[2](13)[1](58)[1](242)[1],[2]
Fair Value, end of period350176350176
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(4)[2]3[2]01[2]
Commercial Mortgage Backed Securities [Member] | Trading Account Assets Supporting Insurance Liabilities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period14555
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0002
Net investment income0000
Purchases, sales, issuances and settlements 0 (1)
Purchases0 10 
Sales0 0 
Issuances0 0 
Settlements0 (1) 
Foreign currency translation0 0 
Other000 
Transfers into Level 300031[1],[2]
Transfers out of Level 3(10)[1],[2]0(10)[1](32)[1],[2]
Fair Value, end of period4545
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0004[2]
Residential Mortgage Backed Securities [Member] | Trading Account Assets Supporting Insurance Liabilities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period2201820
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0001
Net investment income0000
Purchases, sales, issuances and settlements (1) (2)
Purchases0 0 
Sales0 0 
Issuances0 0 
Settlements0 (1) 
Foreign currency translation0 0 
Other00(15)[3] 
Transfers into Level 30000
Transfers out of Level 30000
Fair Value, end of period219219
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0001[2]
Equity Securities [Member] | Trading Account Assets Supporting Insurance Liabilities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period58543
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(7)0(6)2
Net investment income0000
Purchases, sales, issuances and settlements (1) (1)
Purchases1 5 
Sales(2) (29) 
Issuances0 0 
Settlements0 0 
Foreign currency translation1010
Other0000
Transfers into Level 30076[1]0
Transfers out of Level 30000
Fair Value, end of period514514
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(7)[2]0(6)[2]2[2]
Corporate Securities [Member] | Other Trading Asset [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period40343534
Included In Earnings    
Realized investment gains (losses), net 000
Asset management fees and other income2020
Net investment income0000
Purchases, sales, issuances and settlements (1) 1
Purchases1 9 
Sales(3) (7) 
Issuances0 0 
Settlements0 0 
Foreign currency translation0000
Other(1)[4]0(1)[3](2)[4]
Transfers into Level 3001[1]0
Transfers out of Level 30(2)[1]0(2)[1]
Fair Value, end of period39313931
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income1[2]02[2]1[2]
Asset-backed Securities [Member] | Other Trading Asset [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period77555497
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(7)306
Net investment income1121
Purchases, sales, issuances and settlements (11) (64)
Purchases0 0 
Sales(6) (16) 
Issuances0 0 
Settlements(2) (8) 
Foreign currency translation4362
Other1[4]01[3]5[4]
Transfers into Level 3014[1]39[1]20[1]
Transfers out of Level 3(1)[1](5)[1](11)[1](7)[1]
Fair Value, end of period67606760
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(7)[2]1[2](3)[2]4[2]
Commercial Mortgage Backed Securities [Member] | Other Trading Asset [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period18291927
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(1)(1)43
Net investment income0011
Purchases, sales, issuances and settlements (11) (13)
Purchases0 0 
Sales(6) (12) 
Issuances0 0 
Settlements0 (2) 
Foreign currency translation2222
Other14[4]014[3](2)[4]
Transfers into Level 33[1](1)[1]5[1]6[1]
Transfers out of Level 3(1)[1]0(2)[1](6)[1]
Fair Value, end of period29182918
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(4)[2]002[2]
Residential Mortgage Backed Securities [Member] | Other Trading Asset [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period15231812
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(3)202
Net investment income(1)000
Purchases, sales, issuances and settlements (3) (4)
Purchases0 0 
Sales4 (2) 
Issuances0 0 
Settlements0 (1) 
Foreign currency translation1112
Other(14)[4]0(14)[3]2[4]
Transfers into Level 3(1)[1]0010[1]
Transfers out of Level 31[1](3)[1]0(4)[1]
Fair Value, end of period220220
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0[2]1[2]01[2]
Equity Securities [Member] | Other Trading Asset [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period165262624
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income(67)0(54)0
Included in other comprehensive income (loss)0000
Net investment income0000
Purchases, sales, issuances and settlements 1 4
Purchases5 6 
Sales(28) (30) 
Issuances0 0 
Settlements(13) (15) 
Foreign currency translation331360
Other1,277[4]01,277[3]0
Transfers into Level 300126[1],[2]0
Transfers out of Level 30000
Fair Value, end of period1,372281,37228
Included In Earnings    
Realized investment gains (losses), net0[2]000
Asset management fees and other income(73)[2]0(59)[2]0
Included in other comprehensive income (loss)0000
Other Activity [Member] | Other Trading Asset [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period94266134297
Included In Earnings    
Realized investment gains (losses), net74(56)37(1)
Asset management fees and other income0044
Included in other comprehensive income (loss)0000
Net investment income0000
Purchases, sales, issuances and settlements (7) (94)
Purchases0 0 
Sales0 0 
Issuances0 0 
Settlements(7) (14) 
Foreign currency translation0000
Other000(3)[4]
Transfers into Level 30000
Transfers out of Level 30000
Fair Value, end of period161203161203
Included In Earnings    
Realized investment gains (losses), net74[2](57)[2]37[2](1)[2]
Asset management fees and other income1[2](1)[2]4[2]4[2]
Included in other comprehensive income (loss)0000
Other Assets [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period921927
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0(1)0(7)
Interest credited to policyholders' account balances0000
Purchases, sales, issuances and settlements 1 1
Purchases0 0 
Sales0 0 
Issuances0 0 
Settlements0 0 
Transfers into Level 30000
Transfers out of Level 30000
Fair Value, end of period921921
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income000(6)[2]
Interest credited to policyholders' account balances0 00
Separate Accounts Asset [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period17,536[5]13,994[5]15,792[5]13,052[5]
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0000
Interest credited to policyholders' account balances699[5]633[5]2,334[5]1,242[5]
Purchases, sales, issuances and settlements 167[5] 782[5]
Purchases319[5] 2,121[5] 
Sales(925)[5] (1,062)[5] 
Issuances1[5] 3[5] 
Settlements393[5] (861)[5] 
Transfers into Level 315[1],[2],[5]6[1],[5]161[1],[5]41[1],[5]
Transfers out of Level 3(188)[1],[2],[5](58)[1],[5](638)[1],[5](375)[1],[5]
Fair Value, end of period17,850[5]14,742[5]17,850[5]14,742[5]
Included In Earnings    
Realized investment gains (losses), net0000
Asset management fees and other income0000
Interest credited to policyholders' account balances452[2]3151,605[2],[5]409
Future Policy Benefits [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning of period423(989)204(55)
Included In Earnings    
Realized investment gains (losses), net(3,310)(221)(2,854)(1,020)
Asset management fees and other income0000
Purchases, sales, issuances and settlements, net (81) (216)
Purchases(130) (366) 
Sales0 0 
Issuances0 0 
Settlements(1) (2) 
Transfers into Level 30000
Transfers out of Level 30000
Fair Value, End of Period(3,018)(1,291)(3,018)(1,291)
Included In Earnings    
Realized investement gains (losses), net(3,312)[2](230)[2](2,864)[2](1,035)
Asset management fees and other income0000
Long-term Debt [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning of period 0 (429)
Included In Earnings    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Purchases, sales, issuances and settlements, net 0 429
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair Value, End of Period 0 0
Included In Earnings    
Realized investement gains (losses), net 0 0
Asset management fees and other income 0 0
Other Liabilities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning of period(2)(6)(3)(6)
Included In Earnings    
Realized investment gains (losses), net02(7)2
Asset management fees and other income0000
Purchases, sales, issuances and settlements, net 2 2
Purchases0 0 
Sales0 0 
Issuances0 0 
Settlements(1) 7 
Transfers into Level 30000
Transfers out of Level 30000
Fair Value, End of Period(3)(2)(3)(2)
Included In Earnings    
Realized investement gains (losses), net(1)[2]2[2](8)[2]2
Asset management fees and other income0000
Equity Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, beginning of period1,661352355393
Included In Earnings    
Realized investment gains (losses), net(2)1(17)23
Asset management fees and other income0000
Included in other comprehensive income (loss)14(12)42(15)
Net investment income0000
Purchases, sales, issuances and settlements (15) (66)
Purchases4 45 
Sales5 (40) 
Issuances0 0 
Settlements(40) (41) 
Foreign currency translation5021799
Other(1,280)[4]0(831)[3]0
Transfers into Level 3(2)[1]0822[1],[2]3[1]
Transfers out of Level 32[1]0(2)[1],[2]0
Fair Value, end of period412347412347
Included In Earnings    
Realized investment gains (losses), net(3)[2]0(25)[2](29)[2]
Asset management fees and other income0000
Included in other comprehensive income (loss)$ 18$ (12)$ 55$ 30
[1]Transfers into or out of Level 3 are generally reported as the value as of the beginning of the quarter in which the transfer occurs.
[2]Unrealized gains or losses related to assets still held at the end of the period do not include amortization or accretion of premiums and discounts.
[3]Other includes reclasses of certain assets between reporting categories and assets acquired through the Star and Edison acquisition.
[4]Other primarily represents reclasses of certain assets between reporting categories.
[5]Separate account assets represent segregated funds that are invested for certain customers. Investment risks associated with market value changes are borne by the customers, except to the extent of minimum guarantees made by the Company with respect to certain accounts. Separate account liabilities are not included in the above table as they are reported at contract value and not fair value in the Company’s Unaudited Interim Consolidated Statement of Financial Position.