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Share Repurchase Program - Additional Information (Detail) - Jun. 30, 2015 - USD ($) $ / shares in Units, shares in Millions	Total	Total
Equity [Abstract]
Share repurchase program, authorized amount	$ 3,000,000,000	$ 3,000,000,000
Share repurchase program, duration		36 months
Common stock repurchased (Treasury stock)	8.6	33.1
Common stock repurchased, average price per share	$ 51.73	$ 53.66
Common stock repurchased, aggregate amount	$ 447,000,000	$ 1,777,000,000

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The cash outflow to reacquire common stock during the period.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 15



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585



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-Publisher FASB



-Name Accounting Standards Codification



-Glossary Financing Activities



-URI http://asc.fasb.org/extlink&oid=6513228

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 30



-Section 45



-Paragraph 1



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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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