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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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator for earnings (loss) per share, basic
Income (loss) from continuing operations attributable to controlling interest									$ 808	$ (5,839)	$ 1,820
Undistributed earnings allocable to participating securities											(10)
Income (loss) from continuing operations available to shareholders									808	(5,839)	1,810
Denominator for earnings (loss) per share, basic
Weighted-average shares outstanding	359	359	353	350	329	320	320	319	356	322	320
Weighted-average shares for per share calculation, basic	359	359	353	350	329	320	320	319	356	322	320
Per share earnings (loss) from continuing operations, basic									$ 2.27	$ (18.14)	$ 5.66
Numerator for earnings per share, diluted
Income (loss) from continuing operations attributable to controlling interest									808	(5,839)	1,820
Undistributed earnings allocable to participating securities											(10)
Income (loss) from continuing operations available to shareholders									$ 808	$ (5,839)	$ 1,810
Denominator for earnings per share, diluted
Weighted-average shares outstanding	359	359	353	350	329	320	320	319	356	322	320
Weighted-average shares for per share calculation, diluted	360	359	353	350	329	320	320	320	356	322	320
Per share earnings (loss) from continuing operations, diluted									$ 2.27	$ (18.14)	$ 5.66
1.625% Series A 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)	1.625%								1.625%
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									2.4	2.4	2.2