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Fair Value Measurements (Changes in Level 3 Instruments) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Cash Accruals Not Included In Schedule Assets Measured For Fair Value On Recurring Basis $ 0 $ 11 $ 0 $ 11
Level 3 | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 3,859 4,183 4,042 4,175
Net realized/unrealized gains (losses) included in earnings (4) (23) (12) (44)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 158 (161) 221 (74)
Purchases 183 92 243 187
Sales (82) (51) (87) (157)
Settlements (82) (35) (90) (80)
Transfers into Level 3 18 40 7 41
Transfers out of Level 3 8 (27) (267) (27)
Changes in Level 3, ending balance 4,057 4,020 4,057 4,020
Net change in unrealized gains (losses) relating to instruments still held (24) 34 (20) 3
Level 3 | Recurring | Derivatives        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 82 33 88 29
Net realized/unrealized gains (losses) included in earnings (26) (2) (22) 3
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (41) (6) (39) (8)
Transfers into Level 3 11 40 0 40
Transfers out of Level 3 11 0 10 0
Changes in Level 3, ending balance 37 65 37 65
Net change in unrealized gains (losses) relating to instruments still held (24) 33 (20) 40
Level 3 | Recurring | Other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance   225 259 277
Net realized/unrealized gains (losses) included in earnings   4 0 (34)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income   0 0 0
Purchases   0 0 0
Sales   (7) 0 (20)
Settlements   0 0 0
Transfers into Level 3   0 0 0
Transfers out of Level 3   0 (259) 0
Changes in Level 3, ending balance   222   222
Net change in unrealized gains (losses) relating to instruments still held   1 0 (37)
Level 3 | US Corporate | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 3,143 3,163 3,006 3,053
Net realized/unrealized gains (losses) included in earnings 4 (10) 8 (6)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 132 (145) 232 (86)
Purchases 173 87 233 181
Sales 0 (38) (5) (49)
Settlements (35) (20) (43) (56)
Transfers into Level 3 8 0 8 0
Transfers out of Level 3 (3) (13) (18) (13)
Changes in Level 3, ending balance 3,422 3,024 3,422 3,024
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Level 3 | State and municipal | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 31 58 30 58
Net realized/unrealized gains (losses) included in earnings 0 0 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 1 (3) 2 (2)
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 (8) 0 (8)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 32 47 32 47
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Level 3 | Mortgage and asset-backed | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 23 114 32 145
Net realized/unrealized gains (losses) included in earnings (10) (15) (19) (9)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 (8) 0 (9)
Purchases 0 0 0 0
Sales 0 0 0 (32)
Settlements (5) 0 (6) (3)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 (13) 0 (13)
Changes in Level 3, ending balance 8 78 8 78
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Level 3 | Corporate - non-U.S. | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 295 290 290 337
Net realized/unrealized gains (losses) included in earnings 28 0 28 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (5) (7) 0 (4)
Purchases 9 0 9 0
Sales (82) 0 (82) (49)
Settlements 0 0 (1) 0
Transfers into Level 3 (1) 0 (1) 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 244 283 244 283
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Level 3 | Government - non-U.S. | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance   2   2
Net realized/unrealized gains (losses) included in earnings   0   0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income   0   0
Purchases   0   0
Sales   0   0
Settlements   0   0
Transfers into Level 3   0   0
Transfers out of Level 3   0   0
Changes in Level 3, ending balance   2   2
Net change in unrealized gains (losses) relating to instruments still held   0   0
Level 3 | U.S. Government and federal agency | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 277 291 323 266
Net realized/unrealized gains (losses) included in earnings 0 0 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 30 2 (15) 28
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (1) (1)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 307 293 307 293
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Level 3 | Equity | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 9 6 13 9
Net realized/unrealized gains (losses) included in earnings 0 0 (6) 2
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (1) 0 1 (2)
Purchases 0 6 0 6
Sales 0 (6) 0 (6)
Settlements 0 0 0 (4)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 8 6 8 6
Net change in unrealized gains (losses) relating to instruments still held $ 0 $ 0 $ 0 $ 0