Shareholders' Equity (Details) (USD $)	12 Months Ended					12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2000	Dec. 31, 2006	Dec. 31, 2011 Additional Paid-in Capital [Member]	Dec. 31, 2010 Additional Paid-in Capital [Member]	Dec. 31, 2009 Additional Paid-in Capital [Member]	Dec. 31, 2008 Additional Paid-in Capital [Member]	Dec. 31, 2011 Retained Earnings [Member]	Dec. 31, 2010 Retained Earnings [Member]	Dec. 31, 2009 Retained Earnings [Member]	Dec. 31, 2008 Retained Earnings [Member]	Dec. 31, 2011 Deferred Costs, ESOP [Member]	Dec. 31, 2010 Deferred Costs, ESOP [Member]	Dec. 31, 2009 Deferred Costs, ESOP [Member]	Dec. 31, 2008 Deferred Costs, ESOP [Member]	Dec. 31, 2011 Treasury Stock [Member]	Dec. 31, 2010 Treasury Stock [Member]	Dec. 31, 2009 Treasury Stock [Member]	Dec. 31, 2008 Treasury Stock [Member]	Dec. 31, 2011 Treasury Stock, Value [Member]	Dec. 31, 2010 Treasury Stock, Value [Member]	Dec. 31, 2009 Treasury Stock, Value [Member]	Dec. 31, 2008 Treasury Stock, Value [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 13,535,600,000	$ 12,412,800,000				$ 4,886,800,000	$ 4,798,500,000	$ 4,635,600,000	$ 3,976,600,000	$ 14,897,800,000	$ 12,732,600,000	$ 9,830,400,000	$ 7,654,900,000	$ 0	$ (52,400,000)	$ (77,400,000)	$ (86,300,000)					$ 95,300,000	$ 96,400,000	$ 98,500,000	$ 99,200,000
Common stock shares in treasury, shares in thousands	853,000	864,000																853,000	864,000	882,000	889,000
Net income	4,347,700,000	5,069,500,000	4,328,800,000							4,347,700,000	5,069,500,000	4,328,800,000
Dividends, Common Stock, Cash										(2,182,500,000)	(2,167,300,000)	(2,153,300,000)
Common Stock, Dividends, Per Share, Declared	$ 1.96	$ 1.96	$ 1.96
Treasury Stock, Retired, Cost Method, Amount						(100,000)	(1,000,000)	(3,300,000)														(100,000)	(1,000,000)	(3,300,000)
Treasury Stock, Shares, Retired																		(1,000)	(28,000)	(132,000)
Stock Issued During Period, Value, Employee Benefit Plan						(108,700,000)	(87,600,000)	(85,000,000)														(1,000,000)	(1,100,000)	2,600,000
Stock Issued During Period, Shares, Employee Benefit Plan																		(10,000)	10,000	125,000
Stock Granted During Period, Value, Share-based Compensation, Net of Forfeitures						147,400,000	231,000,000	368,500,000
Employee Stock Ownership Plan (ESOP), Gain (Loss) on Transactions in Deferred Shares						49,700,000	20,500,000	6,900,000						52,400,000	25,000,000	8,900,000
Common Stock Issued, Employee Stock Trust								371,900,000
Accelerated Share Repurchases, Settlement Payment or Receipt					2,580,000,000
Stock Repurchased During Period, Value				3,000,000,000
Preferred Stock, Shares Authorized	5,000,000
Common Stock, Shares Held in Employee Trust, Shares	50,000,000	50,000,000
Employee benefit trust	$ 3,013,100,000	$ 3,013,200,000