Capital Transactions (Details 2) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		6 Months Ended
	May. 29, 2015	May. 13, 2015	May. 30, 2014	May. 14, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Dividends
Dividends per common share (in dollars per share)					$ 0	$ 0	$ 0.23	$ 0.20
Dividends paid		$ 167		$ 143			$ 170	$ 147
Dividend equivalent payment	$ 3		$ 4