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Investment Securities (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available for Sale Securities by Type
Cost	$ 4,602	$ 4,935
Gross Unrealized Gains	153	165
Gross Unrealized Losses	(5)	(84)
Estimated Fair Value	4,750	5,016
U.S. States and Political Subdivisions Debt Securities [Member]
Schedule of Available for Sale Securities by Type
Cost	3,628	4,060
Gross Unrealized Gains	130	54
Gross Unrealized Losses	(3)	(79)
Estimated Fair Value	3,755	4,035
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	346	318
Gross Unrealized Gains	4	3
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	349	320
Corporate debt securities [Member]
Schedule of Available for Sale Securities by Type
Cost	39	43
Gross Unrealized Gains	3	3
Gross Unrealized Losses	0	0
Estimated Fair Value	42	46
Mortgage-backed securities [Member]
Schedule of Available for Sale Securities by Type
Cost	137	160
Gross Unrealized Gains	7	5
Gross Unrealized Losses	0	(1)
Estimated Fair Value	144	164
Equity securities [Member]
Schedule of Available for Sale Securities by Type
Cost	0	29
Gross Unrealized Gains	1	95
Gross Unrealized Losses	0	0
Estimated Fair Value	1	124
Foreign government bonds and obligations [Member]
Schedule of Available for Sale Securities by Type
Cost	399	272
Gross Unrealized Gains	8	5
Gross Unrealized Losses	0	(1)
Estimated Fair Value	407	276
Availabe For Sale Securities Other [Member]
Schedule of Available for Sale Securities by Type
Cost	50	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	$ 49	$ 48

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



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-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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- 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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- 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

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-Section 50

-Paragraph 2

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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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