Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Service Cost	$ 71.5	$ 66.7	$ 212.3	$ 193.8
Defined Benefit Plan, Interest Cost	110.0	113.0	328.3	338.7
Defined Benefit Plan, Expected Return on Plan Assets	(176.1)	(171.2)	(525.8)	(512.6)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1.0	0.8	3.0	2.5
Defined Benefit Plan, Actuarial Gain (Loss)	103.8	71.4	302.2	213.3
Defined Benefit Plan, Net Periodic Benefit Cost, Total	110.2	80.7	320.0	235.7
Pension Contributions			55
Pension and Other Postretirement Benefit Contributions			300
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year			5
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Service Cost	15.0	16.1	45.2	48.4
Defined Benefit Plan, Interest Cost	23.4	28.6	70.1	85.6
Defined Benefit Plan, Expected Return on Plan Assets	(32.8)	(31.8)	(98.3)	(95.4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(9.2)	(8.8)	(22.0)	(26.3)
Defined Benefit Plan, Actuarial Gain (Loss)	25.7	24.6	71.9	72.9
Defined Benefit Plan, Net Periodic Benefit Cost, Total	$ 22.1	$ 28.7	$ 66.9	$ 85.2