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Investment Securities (Details 2) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 securities | Dec. 31, 2013 securities
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 6 | 241
Number of securities, 12 months or more | 17 | 11
Number of securities, total | 23 | 252
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 127 | $ 1,759
Estimated Fair Value, 12 months or more | 104 | 123
Estimated Fair Value, Total | 231 | 1,882
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (1) | (67)
Gross Unrealized Losses, 12 months or more | (4) | (17)
Gross Unrealized Losses, Total | (5) | (84)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 6 | 228
Number of securities, 12 months or more | 17 | 6
Number of securities, total | 23 | 234
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | 127 | 1,665
Estimated Fair Value, 12 months or more | 104 | 24
Estimated Fair Value, Total | 231 | 1,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (1) | (53)
Gross Unrealized Losses, 12 months or more | (4) | (2)
Gross Unrealized Losses, Total | (5) | (55)
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months |  | 13
Number of securities, 12 months or more |  | 5
Number of securities, total |  | 18
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months |  | 94
Estimated Fair Value, 12 months or more |  | 99
Estimated Fair Value, Total |  | 193
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months |  | (14)
Gross Unrealized Losses, 12 months or more |  | (15)
Gross Unrealized Losses, Total |  | $ (29)

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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