Variable Interest Entities ("VIE's") (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entities [Abstract]
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets	$ 1,200	$ 1,200
Carrying Amount Of Investments In Qualified Affordable Housing Projects	$ 45	$ 47