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Consolidated Statements of Stockholder's Equity (Parenthetical) - shares shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity [Roll Forward]
Employee stock options (in shares)	1.1	0.7	0.8

X

- Definition

Number of share options (or share units) exercised during the current period.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration