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Securities - Amortized Costs, Fair Value (Details 1) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost$ 319,383,000,000$ 312,241,000,000
Available-for-sale Securities, Gross Unrealized Gains6,905,000,0006,102,000,000
Available-for-sale Securities, Gross Unrealized Losses1,562,000,0002,025,000,000
Available-for-sale Securities324,726,000,000316,318,000,000
Held-to-maturity Securities, Amortized Cost15,000,00018,000,000
Held-to-maturity Securities, Gross unrealized gains1,000,0002,000,000
Held-to-maturity Securities, Gross unrealized losses00
Held-to-maturity Securities, Fair Value16,000,00020,000,000
U.S. government-sponsored enterprise obligations, fair values95,200,000,00094,200,000,000
Accumulated Other-than-Temporary Impairment [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Gross Unrealized Losses102,000,000133,000,000
Equity securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost3,032,000,0001,894,000,000
Available-for-sale Securities, Gross Unrealized Gains206,000,000163,000,000
Available-for-sale Securities, Gross Unrealized Losses3,000,0006,000,000
Available-for-sale Securities3,235,000,0002,051,000,000
Debt Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost316,351,000,000310,347,000,000
Available-for-sale Securities, Gross Unrealized Gains6,699,000,0005,939,000,000
Available-for-sale Securities, Gross Unrealized Losses1,559,000,0002,019,000,000
Available-for-sale Securities321,491,000,000314,267,000,000
Mortgage-backed securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost179,052,000,000171,796,000,000
Available-for-sale Securities, Gross Unrealized Gains4,672,000,0004,032,000,000
Available-for-sale Securities, Gross Unrealized Losses718,000,000973,000,000
Available-for-sale Securities183,006,000,000174,855,000,000
US Government Corporations and Agencies Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost115,271,000,000117,364,000,000
Available-for-sale Securities, Gross Unrealized Gains3,838,000,0003,159,000,000
Available-for-sale Securities, Gross Unrealized Losses208,000,000297,000,000
Available-for-sale Securities118,901,000,000120,226,000,000
Commercial mortgage [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost4,755,000,0005,169,000,000
Available-for-sale Securities, Gross Unrealized Gains430,000,000502,000,000
Available-for-sale Securities, Gross Unrealized Losses13,000,00017,000,000
Available-for-sale Securities5,172,000,0005,654,000,000
Prime and Alt A [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost2,201,000,0002,173,000,000
Available-for-sale Securities, Gross Unrealized Gains72,000,00081,000,000
Available-for-sale Securities, Gross Unrealized Losses180,000,000250,000,000
Available-for-sale Securities2,093,000,0002,004,000,000
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 Cost56,824,000,00047,089,000,000
Available-for-sale Securities, Gross Unrealized Gains332,000,000290,000,000
Available-for-sale Securities, Gross Unrealized Losses317,000,000409,000,000
Available-for-sale Securities56,839,000,00046,970,000,000
U.S. Treasury and government agencies [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost5,197,000,00011,258,000,000
Available-for-sale Securities, Gross Unrealized Gains112,000,000118,000,000
Available-for-sale Securities, Gross Unrealized Losses22,000,00028,000,000
Available-for-sale Securities5,287,000,00011,348,000,000
Obligations of U.S. states and municipalities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost11,353,000,00011,732,000,000
Available-for-sale Securities, Gross Unrealized Gains340,000,000165,000,000
Available-for-sale Securities, Gross Unrealized Losses115,000,000338,000,000
Available-for-sale Securities11,578,000,00011,559,000,000
Certificates of Deposit [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost4,859,000,0003,648,000,000
Available-for-sale Securities, Gross Unrealized Gains2,000,0001,000,000
Available-for-sale Securities, Gross Unrealized Losses02,000,000
Available-for-sale Securities4,861,000,0003,647,000,000
Non-U.S. government debt securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost30,662,000,00020,614,000,000
Available-for-sale Securities, Gross Unrealized Gains217,000,000191,000,000
Available-for-sale Securities, Gross Unrealized Losses63,000,00028,000,000
Available-for-sale Securities30,816,000,00020,777,000,000
Corporate Debt Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost55,927,000,00061,717,000,000
Available-for-sale Securities, Gross Unrealized Gains393,000,000495,000,000
Available-for-sale Securities, Gross Unrealized Losses514,000,000419,000,000
Available-for-sale Securities55,806,000,00061,793,000,000
Credit card receivables, Asset Backed Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost5,124,000,0007,278,000,000
Available-for-sale Securities, Gross Unrealized Gains277,000,000335,000,000
Available-for-sale Securities, Gross Unrealized Losses05,000,000
Available-for-sale Securities5,401,000,0007,608,000,000
Collateralized debt obligations, Asset Backed Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost14,859,000,00013,336,000,000
Available-for-sale Securities, Gross Unrealized Gains509,000,000472,000,000
Available-for-sale Securities, Gross Unrealized Losses117,000,000210,000,000
Available-for-sale Securities15,251,000,00013,598,000,000
Other, Debt Securities [Member]
  
Amortized costs and estimated fair values  
Available-for-sale Securities, Amortized Cost9,318,000,0008,968,000,000
Available-for-sale Securities, Gross Unrealized Gains177,000,000130,000,000
Available-for-sale Securities, Gross Unrealized Losses10,000,00016,000,000
Available-for-sale Securities$ 9,485,000,000$ 9,082,000,000