Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Owned equipment rentals	$ 1,459	$ 1,166
Re-rent revenue	25	21
Ancillary and other rental revenues:
Delivery and pick-up	92	76
Other	77	60
Total ancillary and other rental revenues	169	136
Total equipment rentals	1,459	1,166
Service and other revenues	34	27
Total revenues	1,734	1,356
Topic 840
Revenues:
Re-rent revenue	25	21
Ancillary and other rental revenues:
Delivery and pick-up	0	0
Other	56	45
Total ancillary and other rental revenues	56	45
Total equipment rentals	1,346	1,075
Service and other revenues	0	0
Total revenues	1,346	1,075
Topic 606
Revenues:
Re-rent revenue	0
Ancillary and other rental revenues:
Delivery and pick-up	92
Other	21
Total ancillary and other rental revenues	113
Total equipment rentals	113
Service and other revenues	34
Total revenues	388
Topic 605
Revenues:
Re-rent revenue		0
Ancillary and other rental revenues:
Delivery and pick-up		76
Other		15
Total ancillary and other rental revenues		91
Total equipment rentals		91
Service and other revenues		27
Total revenues		281
Owned equipment rentals
Revenues:
Owned equipment rentals	1,265	1,009
Owned equipment rentals | Topic 840
Revenues:
Owned equipment rentals	1,265	1,009
Owned equipment rentals | Topic 606
Revenues:
Owned equipment rentals	0
Owned equipment rentals | Topic 605
Revenues:
Owned equipment rentals		0
Rental equipment
Ancillary and other rental revenues:
Sales revenue	181	106
Rental equipment | Topic 840
Ancillary and other rental revenues:
Sales revenue	0	0
Rental equipment | Topic 606
Ancillary and other rental revenues:
Sales revenue	181
Rental equipment | Topic 605
Ancillary and other rental revenues:
Sales revenue		106
New equipment
Ancillary and other rental revenues:
Sales revenue	42	39
New equipment | Topic 840
Ancillary and other rental revenues:
Sales revenue	0	0
New equipment | Topic 606
Ancillary and other rental revenues:
Sales revenue	42
New equipment | Topic 605
Ancillary and other rental revenues:
Sales revenue		39
Contractor supplies
Ancillary and other rental revenues:
Sales revenue	18	18
Contractor supplies | Topic 840
Ancillary and other rental revenues:
Sales revenue	0	0
Contractor supplies | Topic 606
Ancillary and other rental revenues:
Sales revenue	$ 18
Contractor supplies | Topic 605
Ancillary and other rental revenues:
Sales revenue		$ 18