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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

X

- 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

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X

- 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

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X

- 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)

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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

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