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Investment Securities (Details 1) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 509 | $ 1,759
Estimated Fair Value, 12 months or more | 132 | 123
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (15) | (67)
Gross Unrealized Losses, 12 months or more | (8) | (17)
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 | 351 | 1,320
Estimated Fair Value, 12 months or more | 115 | 106
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (13) | (63)
Gross Unrealized Losses, 12 months or more | (7) | (16)
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 | 0 | 208
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
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 | 128 | 166
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) | (1)
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 | 0 | 35
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
Other [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 30 | 30
Estimated Fair Value, 12 months or more | 17 | 17
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (1) | (1)
Gross Unrealized Losses, 12 months or more | $ (1) | $ (1)

X
- 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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