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Fair Value Measurements (Changes in Level 3 Instruments) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Domestic Corporate Debt Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3$ 3,668$ 3,283$ 3,668$ 3,283$ 3,097$ 3,199$ 3,124$ 3,068
Net realized/unrealized gains (losses) included in earnings(22)167948    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(32)127(52)208    
Purchases, sales and settlements 38 (13)    
Purchases530 605     
Sales(25) (180)     
Settlements2 (101)     
Transfers in and/or out of Level 3 (22) (28)    
Transfers into Level 3120 120     
Transfers out of Level 3(2) (2)     
Net change in unrealized gains (losses) relating to instruments still held0000    
Residential Mortgage Backed Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 344131441314566131123
Net realized/unrealized gains (losses) included in earnings0(1)0(1)    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(1)7017    
Purchases, sales and settlements 3 2    
Purchases0 2     
Sales0 (4)     
Settlements0 (1)     
Transfers in and/or out of Level 3 (9) (10)    
Transfers into Level 30 71     
Transfers out of Level 30 (90)     
Net change in unrealized gains (losses) relating to instruments still held0000    
Commercial Mortgage Backed Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3852852749551,041
Net realized/unrealized gains (losses) included in earnings00030    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income102(3)    
Purchases, sales and settlements (3) (1,016)    
Purchases0 6     
Sales0 0     
Settlements0 0     
Transfers in and/or out of Level 3 0 0    
Transfers into Level 30 3     
Transfers out of Level 30 (52)     
Net change in unrealized gains (losses) relating to instruments still held0000    
US States and Political Subdivisions Debt Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 38921389213209225270205
Net realized/unrealized gains (losses) included in earnings0000    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income4(48)(1)21    
Purchases, sales and settlements (9) (13)    
Purchases0 4     
Sales0 0     
Settlements(4) (8)     
Transfers in and/or out of Level 3 0 0    
Transfers into Level 30 0     
Transfers out of Level 3(120) (131)     
Net change in unrealized gains (losses) relating to instruments still held0000    
Foreign Corporate Debt Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 31,4391,2141,4391,2141,5371,4861,2271,331
Net realized/unrealized gains (losses) included in earnings19(27)7    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(55)3227(44)    
Purchases, sales and settlements (24) 145    
Purchases0 12     
Sales(26) (54)     
Settlements(14) (74)     
Transfers in and/or out of Level 3 (30) (225)    
Transfers into Level 30 73     
Transfers out of Level 3(4) (4)     
Net change in unrealized gains (losses) relating to instruments still held0000    
Asset-backed Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 32,9052,4032,9052,4033,1322,5401,8851,872
Net realized/unrealized gains (losses) included in earnings06027    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(65)13(10)40    
Purchases, sales and settlements 506 568    
Purchases269 1,049     
Sales(14) (166)     
Settlements0 (11)     
Transfers in and/or out of Level 3 (7) (104)    
Transfers into Level 30 1     
Transfers out of Level 3(417) (498)     
Net change in unrealized gains (losses) relating to instruments still held0000    
Foreign Government Debt Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3112149112149274156116163
Net realized/unrealized gains (losses) included in earnings(1)0(17)0    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(22)7(8)(15)    
Purchases, sales and settlements 0 0    
Purchases14 27     
Sales0 0     
Settlements(13) (13)     
Transfers in and/or out of Level 3 26 1    
Transfers into Level 30 107     
Transfers out of Level 3(140) (140)     
Net change in unrealized gains (losses) relating to instruments still held0000    
US Treasury and Government [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3256246256246224210228256
Net realized/unrealized gains (losses) included in earnings0000    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income321846(9)    
Purchases, sales and settlements 0 (1)    
Purchases0 0     
Sales0 0     
Settlements0 0     
Transfers in and/or out of Level 3 0 0    
Transfers into Level 30 0     
Transfers out of Level 30 0     
Net change in unrealized gains (losses) relating to instruments still held0000    
Retained Interest [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 33741374145394145
Net realized/unrealized gains (losses) included in earnings(1)1(19)0    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(6)1243    
Purchases, sales and settlements (2) (7)    
Purchases1 1     
Sales(1) (4)     
Settlements(1) (4)     
Transfers in and/or out of Level 3 0 0    
Transfers into Level 30 0     
Transfers out of Level 30 0     
Net change in unrealized gains (losses) relating to instruments still held0000    
Available-for-sale Securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 32422242222241719
Net realized/unrealized gains (losses) included in earnings0000    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(1)2(1)1    
Purchases, sales and settlements 0 0    
Purchases0 0     
Sales0 0     
Settlements0 0     
Transfers in and/or out of Level 3 3 2    
Transfers into Level 33 4     
Transfers out of Level 30 (3)     
Net change in unrealized gains (losses) relating to instruments still held0001    
Trading [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 300000000
Net realized/unrealized gains (losses) included in earnings0000    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income0000    
Purchases, sales and settlements 0 0    
Purchases0 0     
Sales0 0     
Settlements0 0     
Transfers in and/or out of Level 3 0 0    
Transfers into Level 30 0     
Transfers out of Level 30 0     
Net change in unrealized gains (losses) relating to instruments still held0000    
Derivatives [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3299438299438297265266236
Net realized/unrealized gains (losses) included in earnings135170194    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income012410    
Purchases, sales and settlements (40) (91)    
Purchases(3) 2     
Sales0 0     
Settlements(7) (197)     
Transfers in and/or out of Level 3 149 89    
Transfers into Level 30 150     
Transfers out of Level 3(1) 5     
Net change in unrealized gains (losses) relating to instruments still held184654119    
Other [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 31,0248331,0248331,149906830891
Net realized/unrealized gains (losses) included in earnings(21)(10)81(35)    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(14)2214(44)    
Purchases, sales and settlements (9) 21    
Purchases27 145     
Sales(116) (116)     
Settlements(1) (6)     
Transfers in and/or out of Level 3 0 0    
Transfers into Level 30 0     
Transfers out of Level 30 0     
Net change in unrealized gains (losses) relating to instruments still held(22)(20)74(34)    
Total [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 39,9059,0259,9059,02510,0389,1658,1909,250
Net realized/unrealized gains (losses) included in earnings(31)72167270    
Net realized/unrealized gains (losses) included in accumulated other comprehensive income(159)19345185    
Purchases, sales and settlements 460 (405)    
Purchases838 1,853     
Sales(182) (524)     
Settlements(38) (415)     
Transfers in and/or out of Level 3 110 (275)    
Transfers into Level 3123 529     
Transfers out of Level 3(684) (915)     
Net change in unrealized gains (losses) relating to instruments still held$ (4)$ 26$ 128$ 86