Stock Benefit Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended															1 Months Ended		12 Months Ended							12 Months Ended			1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member] Shares granted prior to 2004 [Member]	Dec. 31, 2013 Restricted Stock [Member] Shares granted during 2004 [Member]	Dec. 31, 2013 Restricted Stock [Member] Shares granted during 2005 [Member]	Dec. 31, 2013 Restricted Stock [Member] Certain grants in 2005 [Member]	Dec. 31, 2013 Restricted Stock Units And Performance Stock Units [Member]	Dec. 31, 2012 Restricted Stock Units And Performance Stock Units [Member]	Dec. 31, 2011 Restricted Stock Units And Performance Stock Units [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Feb. 29, 2012 Performance Shares [Member]	Feb. 28, 2011 Performance Shares [Member]	Dec. 31, 2013 Performance Shares [Member]	Dec. 31, 2012 Performance Shares [Member]	Dec. 31, 2011 Performance Shares [Member]	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2013 Restricted Stock Units, Restricted Stock and Performance Units [Member]	May 19, 2011 Award Plans 2000 [Member] equity_incentive_plan	Dec. 31, 2013 Incentive and Stock Award Plan 2011 [Member]	Dec. 31, 2013 Incentive and Stock Award Plan 2011 [Member] Stock Options [Member]	Dec. 31, 2013 Previous Equity Incentive Plans [Member] Stock Options [Member]	Dec. 31, 2013 Employee Stock Purchase Plan 1999 [Member] Employee Stock [Member] share_purchase_times	May 31, 2007 International Plan [Member] Employee Stock [Member]	Jul. 31, 2002 International Plan [Member] Employee Stock [Member]	Dec. 31, 2013 International Plan [Member] Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of previous equity plans replaced																							2
Awards authorized (not more than 23.2 million shares for the 2011 Plan and 35.6 million shares for the 1999 Plan)																								23,200,000			35,600,000			12,000,000
Stock options vesting percentage																									25.00%	25.00%
Contractual term of stock option awards																									10 years
Stock appreciation percentage above exercise price																										15.00%
Daily closing price observation period																					10 years
Average Volatility Periods Ending On Fifteen Anniversaries Prior To Valuation Date																					10 years
Options, weighted-average grant-date fair value (in dollars per share)	$ 6.21	$ 6.04	$ 6.67
Total intrinsic value of options exercised	$ 198.1	$ 57.7	$ 23.6
Unrecognized compensation cost related to option awards																					17
Weighted-average period over which that cost is expected to be recognized, years																					1 year 2 months 12 days	1 year
Cash received from the exercise of stock options	281.1	179.3	111.7
Vesting period, years						10 years	7 years	5 years	3 years	3 years
Performance-based restricted stock unit payable range minimum																		0.00%
Performance-based restricted stock unit payable range maximum																		200.00%
Performance period																		3 years
Weighted-average grant-date fair value (in dollars per share)				$ 0.00									$ 36.70	$ 31.96	$ 30.46			$ 36.54	$ 31.89	$ 30.60
Total fair value of deferred stock units				1.1	0.6					205.5	262.6	249.0
Above-target payout percentage																200.00%	190.00%
Target payout percentage																		100.00%
Unrecognized compensation cost																						$ 73.6
Number of share purchase times per plan year																											4
Stock option price percent																											95.00%
Reduction in the shares available																											10,000,000
Shares purchased by employees																											748,842			98,863
Shares available for issuance under the plan																											3,387,471			2,987,099
Shares due to shareholder action																												4,000,000	5,000,000
Fair value assumptions, volatility rate, period before valuation date for traded options																					7 days