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Investment Securities (Details 1) (USD $) In Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2011 | Dec. 31, 2010
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 1,647 | $ 2,905
Estimated Fair Value, 12 months or more | 1,094 | 1,079
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (73) | (159)
Gross Unrealized Losses, 12 months or more | (174) | (212)
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 1,601 | 2,535
Estimated Fair Value, 12 months or more | 1,094 | 1,076
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (72) | (156)
Gross Unrealized Losses, 12 months or more | (174) | (211)
U.S. Government agency obligations [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 299
Estimated Fair Value, 12 months or more | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | 0 | (1)
Gross Unrealized Losses, 12 months or more | 0 | 0
Corporate debt securities [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or more | 0 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | 0 | 0
Gross Unrealized Losses, 12 months or more | 0 | (1)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 46 | 71
Estimated Fair Value, 12 months or more | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (1) | (2)
Gross Unrealized Losses, 12 months or more | $ 0 | $ 0

X
- Definition This item represents the excess of [amortized] cost over fair value of securities that have been in a loss position for twelve months or longer for those securities which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) + Details
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- Definition This item represents the excess of [amortized] cost over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) + Details
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