Stockholders' Equity 1 (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013
Cash dividends
Declaration date	Nov. 06, 2014	Jul. 31, 2014	May 15, 2014	Nov. 06, 2013	Aug. 01, 2013	May 09, 2013
Dividend per share (in dollars per share)	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25
Record date	Nov. 20, 2014	Aug. 21, 2014	May 29, 2014	Nov. 21, 2013	Aug. 22, 2013	May 23, 2013
Total amount	$ 111us-gaap_DividendsCommonStockCash	$ 111us-gaap_DividendsCommonStockCash	$ 111us-gaap_DividendsCommonStockCash	$ 113us-gaap_DividendsCommonStockCash	$ 114us-gaap_DividendsCommonStockCash	$ 114us-gaap_DividendsCommonStockCash
Payment date	Dec. 09, 2014	Sep. 09, 2014	Jun. 17, 2014	Dec. 10, 2013	Sep. 10, 2013	Jun. 11, 2013

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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