Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Income from Continuing Operations Used for Diluted Earnings Per Share Calculation	$ 907	$ 965	$ 412
Weighted Average Number of Shares Outstanding, Basic (in shares)	359	356	353
Incremental Shares From Assumed Conversion of Dilutive Stock Options and Restricted Stock (in shares)	4	3	4
Weighted Average Number of Shares Outstanding, Diluted (in shares)	363	359	357
Earnings from Continuing Operations Per Share, Basic (in dollars per share)	$ 2.53	$ 2.71	$ 1.17
Earnings from Continuing Operations Per Share, Diluted (in dollars per share)	$ 2.50	$ 2.68	$ 1.15
Earnings Per Share Additional Information [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	3	5	4
Weighted average Exercise Price of antidilutive options (in dollars per share)	$ 53.40	$ 48.73	$ 42.70