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Investments (Net Realized Gains (Losses) From Sales Of Available-For-Sale Securities) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments [Abstract]
Proceeds from sales	$ 757us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	$ 1,726us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	$ 4,658us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Available For Sale Securities Realized Gain Loss [Abstract]
Gross realized gains	66us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	57us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	196us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses	$ (15)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	$ (29)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	$ (127)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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