Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Consolidated Balance Sheets [Abstract]
Allowances for accounts receivable, current	$ 59	$ 72
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Shares Authorized	50,000,000
Preferred Stock, Dividend Rate, Percentage	11.125%
Preferred Stock, Shares Issued	19,250,000
Preferred Stock, Shares Outstanding	19,250,000
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	1,750,000,000	1,750,000,000
Common stock, shares outstanding (in shares)	1,168,266,000	1,002,469,000
Common stock, shares issued (in shares)	1,192,986,000	1,027,986,000