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Basis Of Presentation Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	25 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Feb. 26, 2018	Feb. 23, 2017	Feb. 24, 2016
Stock Repurchases [Line Items]
Shares Repurchased and Retired During Period, Shares	3.7	20.2
Shares Repurchased and Retired During Period, Value	$ 99
Weighted Average Market Price of Shares Repurchased and Retired During Period	$ 26.58	$ 28.36
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 351	$ 351
2016 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Repurchased and Retired During Period, Value		275
2017 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Repurchased and Retired During Period, Value		$ 299
Maximum | 2016 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,					$ 275
Maximum | 2017 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,				$ 300
Maximum | 2018 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,			$ 350

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

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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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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-Name Accounting Standards Codification
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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-Topic 210
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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