Consoildated Balance Sheets (Paranthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 10	$ 8
Preferred Par value (usd per share)	$ 0.0001	$ 0.0001
Preferred Authorized shares (shares)	6us-gaap_PreferredStockSharesAuthorized	6us-gaap_PreferredStockSharesAuthorized
Preferred Issued shares (shares)	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred Outstanding shares (shares)	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common Class A [Member]
Common Par value (usd per share)	$ 0.0001	$ 0.0001
Common Authorized shares (shares)	2,500	2,500
Common Stock Issued Shares (shares)	550	531
Common Outstanding shares (shares)	550	531
Common Class B [Member]
Common Par value (usd per share)	$ 0.0001	$ 0.0001
Common Authorized shares (shares)	400	400
Common Stock Issued Shares (shares)	49	50
Common Outstanding shares (shares)	49	50

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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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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