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Securities - Amortized Costs, Fair Value (Details 1) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost$ 333,218,000,000$ 312,241,000,000
Available-for-sale Securities, Gross Unrealized Gains8,640,000,0006,102,000,000
Available-for-sale Securities, Gross Unrealized Losses2,522,000,0002,025,000,000
Available-for-sale Securities339,336,000,000316,318,000,000
Held-to-maturity Securities, Amortized Cost13,000,00018,000,000
Held-to-maturity Securities, Gross unrealized gains1,000,0002,000,000
Held-to-maturity Securities, Gross unrealized losses00
Held-to-maturity Securities, Fair Value14,000,00020,000,000
U.S. government-sponsored enterprise obligations, fair values91,900,000,00094,200,000,000
Accumulated Other-than-Temporary Impairment [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Gross Unrealized Losses93,000,000133,000,000
Equity securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost2,556,000,0001,894,000,000
Available-for-sale Securities, Gross Unrealized Gains64,000,000163,000,000
Available-for-sale Securities, Gross Unrealized Losses1,000,0006,000,000
Available-for-sale Securities2,619,000,0002,051,000,000
Debt Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost330,662,000,000310,347,000,000
Available-for-sale Securities, Gross Unrealized Gains8,576,000,0005,939,000,000
Available-for-sale Securities, Gross Unrealized Losses2,521,000,0002,019,000,000
Available-for-sale Securities336,717,000,000314,267,000,000
Mortgage-backed securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost171,674,000,000171,796,000,000
Available-for-sale Securities, Gross Unrealized Gains5,796,000,0004,032,000,000
Available-for-sale Securities, Gross Unrealized Losses785,000,000973,000,000
Available-for-sale Securities176,685,000,000174,855,000,000
US Government Corporations and Agencies Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost104,941,000,000117,364,000,000
Available-for-sale Securities, Gross Unrealized Gains5,063,000,0003,159,000,000
Available-for-sale Securities, Gross Unrealized Losses2,000,000297,000,000
Available-for-sale Securities110,002,000,000120,226,000,000
Commercial mortgage [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost6,934,000,0005,169,000,000
Available-for-sale Securities, Gross Unrealized Gains418,000,000502,000,000
Available-for-sale Securities, Gross Unrealized Losses77,000,00017,000,000
Available-for-sale Securities7,275,000,0005,654,000,000
Prime and Alt A [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost2,300,000,0002,173,000,000
Available-for-sale Securities, Gross Unrealized Gains66,000,00081,000,000
Available-for-sale Securities, Gross Unrealized Losses176,000,000250,000,000
Available-for-sale Securities2,190,000,0002,004,000,000
Subprime [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost1,000,0001,000,000
Available-for-sale Securities, Gross Unrealized Gains00
Available-for-sale Securities, Gross Unrealized Losses00
Available-for-sale Securities1,000,0001,000,000
Non-U.S. [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost57,498,000,00047,089,000,000
Available-for-sale Securities, Gross Unrealized Gains249,000,000290,000,000
Available-for-sale Securities, Gross Unrealized Losses530,000,000409,000,000
Available-for-sale Securities57,217,000,00046,970,000,000
U.S. Treasury and government agencies [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost7,512,000,00011,258,000,000
Available-for-sale Securities, Gross Unrealized Gains178,000,000118,000,000
Available-for-sale Securities, Gross Unrealized Losses028,000,000
Available-for-sale Securities7,690,000,00011,348,000,000
Obligations of U.S. states and municipalities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost14,223,000,00011,732,000,000
Available-for-sale Securities, Gross Unrealized Gains1,132,000,000165,000,000
Available-for-sale Securities, Gross Unrealized Losses33,000,000338,000,000
Available-for-sale Securities15,322,000,00011,559,000,000
Certificates of Deposit [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost4,972,000,0003,648,000,000
Available-for-sale Securities, Gross Unrealized Gains1,000,0001,000,000
Available-for-sale Securities, Gross Unrealized Losses02,000,000
Available-for-sale Securities4,973,000,0003,647,000,000
Non-U.S. government debt securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost35,536,000,00020,614,000,000
Available-for-sale Securities, Gross Unrealized Gains338,000,000191,000,000
Available-for-sale Securities, Gross Unrealized Losses52,000,00028,000,000
Available-for-sale Securities35,822,000,00020,777,000,000
Corporate Debt Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost61,599,000,00061,717,000,000
Available-for-sale Securities, Gross Unrealized Gains285,000,000495,000,000
Available-for-sale Securities, Gross Unrealized Losses1,462,000,000419,000,000
Available-for-sale Securities60,422,000,00061,793,000,000
Credit card receivables, Asset Backed Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost4,810,000,0007,278,000,000
Available-for-sale Securities, Gross Unrealized Gains179,000,000335,000,000
Available-for-sale Securities, Gross Unrealized Losses05,000,000
Available-for-sale Securities4,989,000,0007,608,000,000
Collateralized debt obligations, Asset Backed Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost21,070,000,00013,336,000,000
Available-for-sale Securities, Gross Unrealized Gains527,000,000472,000,000
Available-for-sale Securities, Gross Unrealized Losses164,000,000210,000,000
Available-for-sale Securities21,433,000,00013,598,000,000
Other, Debt Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost9,266,000,0008,968,000,000
Available-for-sale Securities, Gross Unrealized Gains140,000,000130,000,000
Available-for-sale Securities, Gross Unrealized Losses25,000,00016,000,000
Available-for-sale Securities$ 9,381,000,000$ 9,082,000,000