Capital Contributions and Dividends (Details) (USD $)	0 Months Ended	3 Months Ended
	May 05, 2015	Mar. 31, 2015	Mar. 31, 2014
Subsequent event
Dividends Payable [Line Items]
Dividends payable	$ 231,000,000
Parent Company
Dividends Payable [Line Items]
Capital contribution from parent		0	0
Payments of Dividends		$ 0	$ 0