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Investment Securities (Details 2) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Sep. 30, 2013 securities | Dec. 31, 2012 securities
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | 195,000,000 | 46,000,000
Number of securities, 12 months or more | 8,000,000 | 4,000,000
Number of securities, total | 203,000,000 | 50,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 1,347 | $ 100
Estimated Fair Value, 12 months or more | 85 | 73
Estimated Fair Value, Total | 1,432 | 173
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (59) | (1)
Gross Unrealized Losses, 12 months or more | (11) | (4)
Gross Unrealized Losses, Total | (70) | (5)
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 | 180,000,000 | 46,000,000
Number of securities, 12 months or more | 4,000,000 | 4,000,000
Number of securities, total | 184,000,000 | 50,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | 1,231 | 100
Estimated Fair Value, 12 months or more | 27 | 73
Estimated Fair Value, Total | 1,258 | 173
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (42) | (1)
Gross Unrealized Losses, 12 months or more | (2) | (4)
Gross Unrealized Losses, Total | (44) | (5)
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 | 15,000,000 |
Number of securities, 12 months or more | 4,000,000 |
Number of securities, total | 19,000,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | 116 |
Estimated Fair Value, 12 months or more | 58 |
Estimated Fair Value, Total | 174 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (17) |
Gross Unrealized Losses, 12 months or more | (9) |
Gross Unrealized Losses, Total | $ (26) |

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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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