Income Taxes (Schedule Of Changes In Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Balance at beginning of year	$ 131	$ 241
Unrecognized tax benefits, Tax positions taken in prior periods	36	(19)
Unrecognized tax benefits, Tax positions taken in current year		31
Unrecognized tax benefits, Accrual of interest related to tax positions taken	39	(5)
Unrecognized tax benefits, Settlements		(108)
Unrecognized tax benefits, Lapse of statute of limitations	(5)
Unrecognized tax benefits, Foreign currency translation	1	(9)
Unrecognized tax benefits, Balance at end of year	$ 202	$ 131