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Investment Securities (Details 1) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 1,759 | $ 100
Estimated Fair Value, 12 months or more | 123 | 73
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (67) | (1)
Gross Unrealized Losses, 12 months or more | (17) | (4)
State and municipal obligations [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 1,320 | 100
Estimated Fair Value, 12 months or more | 106 | 73
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (63) | (1)
Gross Unrealized Losses, 12 months or more | (16) | (4)
Foreign government bonds and obligations [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 208 | 0
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) | 0
Gross Unrealized Losses, 12 months or more | 0 | 0
U.S. Government treasury obligations [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 166 | 0
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) | 0
Gross Unrealized Losses, 12 months or more | 0 | 0
Mortgage-backed securities [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 35 | 0
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) | 0
Gross Unrealized Losses, 12 months or more | 0 | 0
Other [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 30 | 0
Estimated Fair Value, 12 months or more | 17 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (1) | 0
Gross Unrealized Losses, 12 months or more | $ (1) | $ 0

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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 investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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 categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized 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 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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