Capital Stock (Narrative) (Details) (USD $) In Millions, except 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	Dec. 31, 2012 2012 $405.0 Million Repurchase Agreement [Member]	Dec. 31, 2013 2011 $500.0 Million Repurchase Agreement [Member]	Dec. 31, 2011 2011 $500.0 Million Repurchase Agreement [Member]	Dec. 31, 2013 2010 $500.0 Million Repurchase Agreement [Member]	Dec. 31, 2010 2010 $500.0 Million Repurchase Agreement [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Performance Stock Units (PSUs) [Member]	Dec. 31, 2013 Employee Stock Purchase Plans [Member]	Dec. 31, 2012 Employee Stock Purchase Plans [Member]
Cash dividends declared, per share of common stock	$ 0.305	$ 0.265	$ 0.265	$ 0.265	$ 0.265	$ 0.2125	$ 0.2125	$ 0.2125	$ 1.10	$ 0.9025	$ 0.7525
Repurchase of Common Stock, Amount Authorized												$ 405		$ 500		$ 500
Stock Repurchased and Retired During Period, Shares									4,800,000	2,100,000	11,800,000		3,400,000		1,400,000
Stock Repurchased and Retired During Period, Value									317	108	622		222		95
Stock Repurchase Program, Remaining Authorized Repurchase Amount									683				278
Shares Reserved for Future Issuance Compensation Grants	23,000,000				29,000,000				23,000,000	29,000,000
Preferred Stock, Shares Authorized	500,000								500,000
Preferred Stock, Par or Stated Value Per Share	$ 1								$ 1
Options granted for period in number of years				10
Aggregate Intrinsic Value of Options Exercised									97	52	69
Exercise price for option outstanding lower range									$ 37.86
Excercise price for options outstanding upper range									$ 67.80
Unrecognized compensation cost	65								65								50		7
Unrecognized compensation cost weighted-average period of recognition, years									1 year 7 months								1 year		1 year
Granted restricted stock units weighted average fair value per share																	$ 60.81	$ 50.90	$ 64.01
Fair value of RSU vested																	$ 35
Percentage of Closing Stock Price Represents Purchase Price Under ESPP																				95.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																				163,533	196,267