Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Reserves on receivables	$ 22	$ 12
Preferred stock - par value	$ 1	$ 1
Preferred stock - authorized shares	36,000,000us-gaap_PreferredStockSharesAuthorized	36,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock - outstanding shares	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common stock - par value	$ 0.1	$ 0.1
Common stock - authorized shares	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common stock - issued shares	144,768,000us-gaap_CommonStockSharesIssued	137,314,000us-gaap_CommonStockSharesIssued

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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