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Earnings (Loss) Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator for earnings (loss) per share, basic
Income (loss) from continuing operations attributable to controlling interest									$ 1,406	$ 808	$ (5,839)
Undistributed earnings allocable to participating securities									(12)
Income (loss) from continuing operations available to shareholders									1,394	808	(5,839)
Denominator for earnings (loss) per share, basic
Weighted-average shares outstanding	361	361	360	360	359	359	353	350	360	356	322
Weighted-average shares for per share calculation, basic	361	361	360	360	359	359	353	350	360	356	322
Per share earnings (loss) from continuing operations, basic									$ 3.87	$ 2.27	$ (18.14)
Numerator for earnings (loss) per share, diluted
Income (loss) from continuing operations attributable to controlling interest									1,406	808	(5,839)
Undistributed earnings allocable to participating securities									(12)
Income (loss) from continuing operations available to shareholders									$ 1,394	$ 808	$ (5,839)
Denominator for earnings (loss) per share, diluted
Weighted-average shares outstanding	361	361	360	360	359	359	353	350	360	356	322
Weighted-average shares for per share calculation, diluted	361	361	360	360	360	359	353	350	360	356	322
Earnings (loss) from continuing operations (in dollars per share)									$ 3.87	$ 2.27	$ (18.14)
1.50% Series B Convertible Senior Notes due December 2037
Anti-dilutive securities
Interest rate on convertible debt not having effect on earning per share calculation (as a percent)	1.50%								1.50%
1.50% Series C Convertible Senior Notes due December 2037
Anti-dilutive securities
Interest rate on convertible debt not having effect on earning per share calculation (as a percent)	1.50%								1.50%
Share-based awards
Anti-dilutive securities
Share-based awards excluded from earnings per share calculation (in shares)									1.4	2.4	2.4