Debt (Schedule Of Short-Term Debt And Current Portion Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Unsecured debt securities	$ 255	$ 1,004
Non-recourse debt and notes	33	36
Capital Lease Obligations	57	53
Other notes	39	141
Short-term debt and current portion of long-term debt	$ 384	$ 1,234