Restructuring Charges (Schedule Of Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Charged to Costs and Expenses	$ 22		$ 50	$ 14	$ 6
Closed Restructuring Programs
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			17	16	20
Charged to Costs and Expenses		$ 6	2	14	6
Payments and Other			(6)	(13)	(10)
Ending Reserve Balance	13	17	13	17	16
Closed Restructuring Programs | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			16	13	20
Charged to Costs and Expenses			2	10	2
Payments and Other			(5)	(7)	(9)
Ending Reserve Balance	13	16	13	16	13
Closed Restructuring Programs | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			1	3	0
Charged to Costs and Expenses			0	4	4
Payments and Other			(1)	(6)	(1)
Ending Reserve Balance	0	1	0	1	$ 3
NES, Neff And Project XL Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			0
Charged to Costs and Expenses			48
Payments and Other			(28)
Ending Reserve Balance	20	0	20	0
NES, Neff And Project XL Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			0
Charged to Costs and Expenses			9
Payments and Other			(1)
Ending Reserve Balance	8	0	8	0
NES, Neff And Project XL Restructuring Program | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			0
Charged to Costs and Expenses			39
Payments and Other			(27)
Ending Reserve Balance	$ 12	$ 0	$ 12	$ 0