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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended				9 Months Ended
	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2015
Class of Stock Disclosures [Abstract]
Cash dividends declared, per share of common stock	$ 0.425	$ 0.425	$ 0.425		$ 1.275
Stock Repurchased During Period, Shares				1.9
Payments for Repurchase of Common Stock				$ 230,000,000	$ 230,000,000	$ 13,000,000
2015 $2 Billion Repurchase Agreement
Stock Repurchase Program, Authorized Amount							$ 2,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount					$ 1,640,000,000

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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The cash outflow to reacquire common stock during the period.

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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)
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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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(28))
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