Retirement Benefits (Schedule of Expected Benefit Payments, Contributions and Expense) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan, Accumulated Benefit Obligation		$ 8,200,000,000	$ 7,230,000,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation		8,120,000,000	7,120,000,000
Defined Benefit Plan, Plans with Projected Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets		5,960,000,000	5,930,000,000
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Benefit Obligation		7,030,000,000	1,100,000,000
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets		5,750,000,000	136,300,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation		209,400,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components		15,100,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation		187,100,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components		12,300,000
Defined benefit pension and retiree health benefit plans		(1,240,200,000)	148,900,000	(280,300,000)
Defined Contribution Plan, Cost Recognized		117,600,000	119,800,000	127,600,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payments in Year One		416,100,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two		424,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three		437,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four		449,900,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five		464,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter		2,609,200,000
Defined Benefit Plan, Service Cost		236,300,000	219,200,000	242,100,000
Defined Benefit Plan, Interest Cost		447,900,000	431,600,000	417,500,000
Defined Benefit Plan, Expected Return on Plan Assets		(685,900,000)	(638,200,000)	(584,900,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		8,600,000	8,800,000	8,000,000
Defined Benefit Plan, Amortization of Net Gains (Losses)		200,400,000	163,000,000	84,500,000
Defined Benefit Plan, Net Periodic Benefit Cost, Total		207,300,000	184,400,000	167,200,000
Other Comprehensive Income, Defined Benefit Plan's Net Unamortized Gain (Loss) Arising During Period, before Tax		1,266,000,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax		10,000,000
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	3,300,000	(8,600,000)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	285,300,000	(200,400,000)
Foreign currency translation gains (losses)		(4,900,000)
Defined benefit pension and retiree health benefit plans		1,062,100,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payments in Year One		107,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two		109,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three		112,600,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four		114,900,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five		121,700,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter		699,100,000
Defined Benefit Plan, Service Cost		72,400,000	56,500,000	53,700,000
Defined Benefit Plan, Interest Cost		118,000,000	121,400,000	119,600,000
Defined Benefit Plan, Expected Return on Plan Assets		(129,400,000)	(122,600,000)	(117,900,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		(42,900,000)	(37,200,000)	(36,000,000)
Defined Benefit Plan, Amortization of Net Gains (Losses)		88,700,000	85,000,000	71,800,000
Defined Benefit Plan, Net Periodic Benefit Cost, Total		106,800,000	103,100,000	91,200,000
Other Comprehensive Income, Defined Benefit Plan's Net Unamortized Gain (Loss) Arising During Period, before Tax		221,300,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax		1,100,000
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax	35,100,000	42,900,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	95,700,000	(88,700,000)
Foreign currency translation gains (losses)		1,500,000
Defined benefit pension and retiree health benefit plans		178,100,000
Other Postretirement Benefit Plans, Defined Benefit, Gross [Member]
Defined Benefit Plan, Expected Future Benefit Payments in Year One		118,700,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two		119,100,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three		123,600,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four		127,300,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five		135,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter		790,800,000
Other Postretirement Benefit Plans, Defined Benefit Plans, Medicare Rebates [Member]
Defined Benefit Plan, Expected Future Benefit Payments in Year One		(11,700,000)
Defined Benefit Plan, Expected Future Benefit Payments in Year Two		(9,900,000)
Defined Benefit Plan, Expected Future Benefit Payments in Year Three		(11,000,000)
Defined Benefit Plan, Expected Future Benefit Payments in Year Four		(12,400,000)
Defined Benefit Plan, Expected Future Benefit Payments in Year Five		(13,500,000)
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter		$ (91,700,000)