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Investment Securities (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available for Sale Securities by Type |  |
Cost | $ 4,935 | $ 5,145
Gross Unrealized Gains | 165 | 474
Gross Unrealized Losses | (84) | (5)
Estimated Fair Value | 5,016 | 5,614
State and municipal obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 4,060 | 4,280
Gross Unrealized Gains | 54 | 199
Gross Unrealized Losses | (79) | (5)
Estimated Fair Value | 4,035 | 4,474
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 3 | 3
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 3 | 3
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 318 | 330
Gross Unrealized Gains | 3 | 8
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 320 | 338
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 43 | 73
Gross Unrealized Gains | 3 | 6
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 46 | 79
Mortgage-backed securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 160 | 210
Gross Unrealized Gains | 5 | 14
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 164 | 224
Equity securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 29 | 64
Gross Unrealized Gains | 95 | 232
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 124 | 296
Foreign government bonds and obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 272 | 134
Gross Unrealized Gains | 5 | 15
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 276 | 149
Other [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 50 | 51
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | 0
Estimated Fair Value | $ 48 | $ 51

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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