Capital Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Class of Stock [Line Items]
Payments of Ordinary Dividends, Preferred Stock and Preference Stock		$ 29	$ 29	$ 15
Common Stock Dividends Paid		12	0	0
Preferred Stock, Liquidation Preference Per Share	$ 50	$ 50	$ 50
Preferred Stock, Par or Stated Value Per Share	$ 0	$ 0	$ 0
Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued					10,000,000
Payments of Ordinary Dividends, Preferred Stock and Preference Stock		29	29	15
Dividends Payable, Date Declared	Nov. 21, 2013
Preferred Stock, Dividend Payment Terms		Dividends accrue and accumulate from the date of issuance and, to the extent that we are legally permitted to pay a dividend and the Board of Directors declares a dividend payable, we will pay dividends in cash on January 1, April 1, July 1 and October 1 of each year, commencing on July 1, 2011 and ending on April 1, 2014.
Dividends Payable, Amount Per Share	$ 0.7344	$ 0.7344
Dividends Payable	7	7
Dividends Payable, Date to be Paid	Jan. 02, 2014
Dividends Payable, Date of Record	Dec. 13, 2013
Preferred Stock, Dividend Rate, Percentage		5.875%
Preferred Stock, Liquidation Preference Per Share	$ 50.00	$ 50.00
Preferred Stock, Par or Stated Value Per Share					$ 50.00
Convertible Preferred Stock, Terms of Conversion		Unless converted earlier, each share of the mandatory convertible preferred stock will automatically convert on April 1, 2014 into between 2.7454 and 3.4317 shares of common stock, depending on the market value of our common stock for the 20 consecutive trading day period ending on the third trading day prior to April 1, 2014, subject to customary anti-dilution adjustments (including in connection with the declaration of dividends on our common stock). At any time prior to April 1, 2014, holders may elect to convert shares of the mandatory convertible preferred stock at the minimum conversion rate of 2.7454 shares of common stock, subject to customary anti-dilution adjustments (including in connection with the declaration of dividends on our common stock). If certain fundamental changes involving the Company occur, holders of the mandatory convertible preferred stock may convert their shares into a number of shares of common stock at the fundamental change conversion rate described in our Amended Articles of Incorporation.
Preferred Stock, Voting Rights		Except as required by law or as specifically set forth in our Amended Articles of Incorporation, the holders of the mandatory convertible preferred stock have no voting rights.
Preferred Stock, Dividend Preference or Restrictions		So long as any of the mandatory convertible preferred stock is outstanding, no dividend, except a dividend payable in shares of our common stock, or other shares ranking junior to the mandatory convertible preferred stock, may be paid or declared or any distribution be made on shares of the common stock unless all accrued and unpaid dividends on the then outstanding mandatory convertible preferred stock payable on all dividend payment dates occurring on or prior to the date of such action have been declared and paid or funds sufficient therefor set apart.
Common Stock
Class of Stock [Line Items]
Dividends Payable, Date Declared	Jan. 13, 2014
Common Stock, Dividends, Per Share, Declared	$ 0.05
Dividends Payable, Date to be Paid	Mar. 03, 2014
Dividends Payable, Date of Record	Jan. 31, 2014
Common Stock Dividends Paid		12
Dividends, Common Stock, Cash		$ 12