Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (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
Earnings Per Share [Abstract]
Income (loss) from continuing operations, net of tax									$ 284	$ (960)	$ 506
Weighted Average Number of Shares Outstanding, Basic (in shares)									743	755	778
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.23)	$ 0.24	$ 0.22	$ 0.15	$ 0.29	$ (2.12)	$ 0.10	$ 0.43	$ 0.38	$ (1.27)	$ 0.65
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)									1	0	2
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in shares)									4	0	3
Income Loss From Continuing Operations Diluted									$ 284	$ (960)	$ 506
Weighted Average Number of Shares Outstanding, Diluted (in shares)									748	755	783
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.23)	$ 0.24	$ 0.22	$ 0.15	$ 0.29	$ (2.12)	$ 0.10	$ 0.43	$ 0.38	$ (1.27)	$ 0.65