Debt Debt (Credit Facility) (Details) (Details) (USD $)	Dec. 31, 2013	Jun. 30, 2014 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Ratio of Indebtedness to Net Capital		0.35
Ratio of Debt of Subsidiaries to Net Capital		10.00%
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,750,000,000
Line of Credit Facility, Amount Outstanding	238,000,000
Line Of Credit Facility Maximum Borrowing Capacity Available Support Letters Of Credit		250,000,000
Net Worth After Tax Effect		$ 14,900,000,000