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Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Feb. 25, 2014
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased under the authorization	154,722	1,479,411	1,118,820	3,503,349
Treasury Stock Acquired, Average Cost Per Share	$ 16.16	$ 26.74	$ 15.50	$ 27.31
Stock Repurchased During Period, Value	$ 3	$ 40	$ 17	$ 96
Share Repurchase Program Twenty Fourteen [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 350
Number of shares repurchased under the authorization	0	1,403,283	496,440	2,973,629
Treasury Stock Acquired, Average Cost Per Share		$ 26.74	$ 15.12	$ 27.25
Stock Repurchased During Period, Value	$ 0	$ 38	$ 7	$ 81
Share Maintenance Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased under the authorization	154,722	76,128	622,380	529,720
Treasury Stock Acquired, Average Cost Per Share	$ 16.16	$ 26.79	$ 15.81	$ 27.67
Stock Repurchased During Period, Value	$ 3	$ 2	$ 10	$ 15

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Amount of 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.

+ 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



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-Name Regulation S-X (SX)



-Number 210



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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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.

+ 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



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

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 30



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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