Shareholders' Equity - Treasury Stock (Details) shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($) shares
Stockholders' Equity Note [Abstract]
Authorized share repurchase programs	$ 8,000
Share repurchase cost	7,755
Share repurchase fees	$ 12
Number of shares repurchased \| shares	695,230
Share Repurchase Program Combined Authorization	$ 8,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 245

Amount of stock repurchase plan authorized.

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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- Definition

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
-Section 02
-Paragraph 29, 30, 31
-Article 5

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

+ Details

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- References

No definition available.

+ Details

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ 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 02
-Paragraph 29, 30
-Article 5

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

+ Details

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- Definition

Fees Associated With Repurchase of Stock

+ References

No definition available.

+ Details

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- Definition

Share Repurchase Program Combined Authorizaiton - represents the cumulative amount of authorized share repurchase programs approved by the Board of Directors .

+ References

No definition available.

+ Details

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