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Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		13 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017
Earnings Per Share [Abstract]
Target Achievement Percentage	100.00%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	7,300,000	6,000,000
Stock Repurchases [Abstract]
Shares Repurchased and Retired During Period, Shares	2,200,000		9,300,000
Shares Repurchased and Retired During Period, Value	$ 60		$ 259
Weighted Average Market Price of Shares Repurchased and Retired During Period	$ 27.82		$ 27.93
Common Stock Settlement Date after Period End [Member]
Stock Repurchases [Abstract]
Shares Repurchased and Retired During Period, Shares	226,352

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Weighted Average Market Price of Stock Repurchased and Retired During Period.

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Stock Repurchases [Abstract]

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Target Achievement Percentage

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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