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Fair Value Measurements (Changes in Level 3 Instruments) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2011
Dec. 31, 2010
Mar. 31, 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 $ 3,097 $ 3,124 $ 3,097 $ 3,124 $ 3,120 $ 3,199 $ 2,819 $ 3,068
Net realized/unrealized gains (losses) included in earnings 14 16 101 32        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 3 31 (20) 81        
Purchases, sales and settlements   264   (51)        
Purchases 30   75          
Sales (41)   (155)          
Settlements (29)   (103)          
Transfers in and/or out of Level 3   (6)   (6)        
Transfers into Level 3 0   0          
Transfers out of Level 3 0   0          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
Residential Mortgage Backed Securities [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 45 131 45 131 118 66 133 123
Net realized/unrealized gains (losses) included in earnings 0 0 0 0        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (2) (7) 1 10        
Purchases, sales and settlements   (1)   (1)        
Purchases 1   2          
Sales 0   (4)          
Settlements 0   (1)          
Transfers in and/or out of Level 3   6   (1)        
Transfers into Level 3 0   71          
Transfers out of Level 3 (72)   (90)          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
Commercial Mortgage Backed Securities [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 7 55 7 55 11 49 119 1,041
Net realized/unrealized gains (losses) included in earnings 0 0 0 30        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 1 (5) 1 (3)        
Purchases, sales and settlements   (62)   (1,013)        
Purchases (1)   6          
Sales 0   0          
Settlements 0   0          
Transfers in and/or out of Level 3   3   0        
Transfers into Level 3 0   3          
Transfers out of Level 3 (4)   (52)          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
US States and Political Subdivisions Debt Securities [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 209 270 209 270 210 225 275 205
Net realized/unrealized gains (losses) included in earnings 0 0 0 0        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 (5) (5) 69        
Purchases, sales and settlements   0   (4)        
Purchases 0   4          
Sales 0   0          
Settlements (1)   (4)          
Transfers in and/or out of Level 3   0   0        
Transfers into Level 3 0   0          
Transfers out of Level 3 0   (11)          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
Foreign Corporate Debt Securities [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 1,537 1,227 1,537 1,227 1,479 1,486 1,357 1,331
Net realized/unrealized gains (losses) included in earnings (1) 2 (28) (2)        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 28 (57) 82 (76)        
Purchases, sales and settlements   (22)   169        
Purchases 0   12          
Sales 0   (28)          
Settlements (31)   (60)          
Transfers in and/or out of Level 3   (53)   (195)        
Transfers into Level 3 62   73          
Transfers out of Level 3 0   0          
Net change in unrealized gains (losses) relating to instruments still held 0 (7) 0 (20)        
Asset-backed Securities [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 3,132 1,885 3,132 1,885 2,826 2,540 1,862 1,872
Net realized/unrealized gains (losses) included in earnings (3) 12 0 21        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (19) 4 55 27        
Purchases, sales and settlements   78   62        
Purchases 409   780          
Sales (43)   (152)          
Settlements (1)   (11)          
Transfers in and/or out of Level 3   (71)   (97)        
Transfers into Level 3 0   1          
Transfers out of Level 3 (37)   (81)          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
Foreign Government Debt Securities [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 274 116 274 116 162 156 136 163
Net realized/unrealized gains (losses) included in earnings (16) 0 (16) 0        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 8 (20) 14 (22)        
Purchases, sales and settlements   0   0        
Purchases 13   13          
Sales 0   0          
Settlements 0   0          
Transfers in and/or out of Level 3   0   (25)        
Transfers into Level 3 107   107          
Transfers out of Level 3 0   0          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
US Treasury and Government [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 224 228 224 228 201 210 244 256
Net realized/unrealized gains (losses) included in earnings 0 0 0 0        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 23 (15) 14 (27)        
Purchases, sales and settlements   (1)   (1)        
Purchases 0   0          
Sales 0   0          
Settlements 0   0          
Transfers in and/or out of Level 3   0   0        
Transfers into Level 3 0   0          
Transfers out of Level 3 0   0          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
Retained Interest [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 45 41 45 41 52 39 43 45
Net realized/unrealized gains (losses) included in earnings 1 (1) (18) (1)        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (4) 1 30 2        
Purchases, sales and settlements   (2)   (5)        
Purchases 0   0          
Sales (2)   (3)          
Settlements (2)   (3)          
Transfers in and/or out of Level 3   0   0        
Transfers into Level 3 0   0          
Transfers out of Level 3 0   0          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
Available-for-sale Securities [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 22 17 22 17 21 24 19 19
Net realized/unrealized gains (losses) included in earnings 0 0 0 0        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 1 (1) 0 (1)        
Purchases, sales and settlements   0   0        
Purchases 0   0          
Sales 0   0          
Settlements 0   0          
Transfers in and/or out of Level 3   (1)   (1)        
Transfers into Level 3 0   1          
Transfers out of Level 3 0   (3)          
Net change in unrealized gains (losses) relating to instruments still held 0 1 0 1        
Trading [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 0 0 0 0 0 0 0 0
Net realized/unrealized gains (losses) included in earnings 0 0 0 0        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0 0 0        
Purchases, sales and settlements   0   0        
Purchases 0   0          
Sales 0   0          
Settlements 0   0          
Transfers in and/or out of Level 3   0   0        
Transfers into Level 3 0   0          
Transfers out of Level 3 0   0          
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0        
Derivatives [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 297 266 297 266 272 265 200 236
Net realized/unrealized gains (losses) included in earnings 29 55 57 143        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 5 4 (2)        
Purchases, sales and settlements   6   (51)        
Purchases 1   5          
Sales 0   0          
Settlements (5)   (190)          
Transfers in and/or out of Level 3   0   (60)        
Transfers into Level 3 0   150          
Transfers out of Level 3 0   6          
Net change in unrealized gains (losses) relating to instruments still held 4 61 35 88        
Other [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 1,149 880 1,149 880 987 906 827 891
Net realized/unrealized gains (losses) included in earnings 43 (10) 102 (25)        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 12 (43) 28 (66)        
Purchases, sales and settlements   28   30        
Purchases 112   118          
Sales 0   0          
Settlements (5)   (5)          
Transfers in and/or out of Level 3   28   0        
Transfers into Level 3 0   0          
Transfers out of Level 3 0   0          
Net change in unrealized gains (losses) relating to instruments still held 39 (10) 96 (19)        
Total [Member]
               
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Changes in Level 3 10,038 8,190 10,038 8,190 9,459 9,165 8,034 9,250
Net realized/unrealized gains (losses) included in earnings 67 74 198 198        
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 51 (112) 204 (8)        
Purchases, sales and settlements   288   (865)        
Purchases 565   1,015          
Sales (86)   (342)          
Settlements (74)   (377)          
Transfers in and/or out of Level 3   (94)   (385)        
Transfers into Level 3 169   406          
Transfers out of Level 3 (113)   (231)          
Net change in unrealized gains (losses) relating to instruments still held $ 43 $ 45 $ 131 $ 50