Common Stock (Details) (Pension Plan, Defined Benefit [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 12, 2013
Class of Stock [Line Items]
Pension Contributions				$ 250
Common Stock [Member]
Class of Stock [Line Items]
Pension Contributions	$ 100	$ 50	$ 50	$ 200
Contribution of Common Stock to Pension Plan Shares	1,522,301	753,579	750,075
Contribution of Common Stock to Pension Plans Amount Per Share		$ 66.35	$ 66.66		$ 65.69