Stockholders' Equity Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 17, 2015	Jul. 30, 2015	May. 20, 2015	Feb. 27, 2015	Dec. 10, 2014	Jul. 30, 2014	Apr. 17, 2014	Feb. 06, 2014	Dec. 12, 2013	Aug. 01, 2013	May. 28, 2013	Jun. 30, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Dividends Payable, Amount Per Share	$ 0.115	$ 0.115	$ 0.115	$ 0.115	$ 0.115	$ 0.115	$ 0.115	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.115	$ 0.10
Dividends, Common Stock, Cash	$ 230	$ 229	$ 226	$ 229	$ 234	$ 239	$ 237	$ 209	$ 206	$ 210	$ 212