Derivative Financial Instruments (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative Liabilities [Abstract]
Gross amount recognized	$ 5	$ 7
Gross amount offset in the consolidated balance sheets	2	4
Net amount presented in the consolidated balance sheets	3	3
Gross amount not offset in the consolidated balance sheets	1	2
Net amount	$ 2	$ 1