Capital Stock (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($) $ / shares shares
Cash dividends declared, per share of common stock \| $ / shares	$ 0.38
Stock Repurchased and Retired During Period, Shares \| shares	100
Repurchase and retirement of 1.3 million shares of common stock	$ 13
2012 $405.0 Million Repurchase Agreement
Stock Repurchased and Retired During Period, Shares \| shares	135
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 0
2015 $2.0 Billion Repurchase Agreement
Repurchase and retirement of 1.3 million shares of common stock	$ 0

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

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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+ References

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- Definition

Number of shares that have been repurchased and retired during the period.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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