Capital Transactions (Details) (USD $)	0 Months Ended		3 Months Ended
	Oct. 11, 2013	Feb. 03, 2015	Mar. 31, 2015
Share Repurchase Program [Line Items]
Shares of common stock repurchased	429,000,000
2015 Share Repurchase Program
Share Repurchase Program [Line Items]
Stock repurchase program, dollar amount authorized		$ 750,000,000
Cost of common stock repurchased under the stock repurchase program			$ 0
Shares of common stock repurchased			0