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Investment Securities (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Schedule of Available for Sale Securities by Type |  |
Cost | $ 9,029 | $ 13,937
Gross Unrealized Gains | 345 | 444
Gross Unrealized Losses | (105) | (371)
Investment securities | 9,269 | 14,010
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 5,205 | 6,140
Gross Unrealized Gains | 82 | 24
Gross Unrealized Losses | (102) | (367)
Investment securities | 5,185 | 5,797
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 352 | 3,402
Gross Unrealized Gains | 3 | 12
Gross Unrealized Losses | 0 | (1)
Investment securities | 355 | 3,413
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1,932 | 2,450
Gross Unrealized Gains | 11 | 6
Gross Unrealized Losses | 0 | 0
Investment securities | 1,943 | 2,456
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1,006 | 1,431
Gross Unrealized Gains | 11 | 15
Gross Unrealized Losses | (3) | (1)
Investment securities | 1,014 | 1,445
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 272 | 272
Gross Unrealized Gains | 16 | 6
Gross Unrealized Losses | 0 | (2)
Investment securities | 288 | 276
Equity securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 98 | 98
Gross Unrealized Gains | 215 | 377
Gross Unrealized Losses | 0 | 0
Investment securities | 313 | 475
Foreign government bonds and obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 107 | 95
Gross Unrealized Gains | 6 | 4
Gross Unrealized Losses | 0 | 0
Investment securities | 113 | 99
Availabe For Sale Securities Other [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 57 | 49
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | 0
Investment securities | $ 58 | $ 49

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