Income Taxes (Components of deferred tax assets and liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Reserves and allowances	$ 165	$ 129
Debt cancellation and other	16	10
Net operating loss and credit carryforwards	175	242
Operating lease assets	210	183
Total deferred tax assets	566	564
Valuation allowance	(9)	(21)
Total net deferred tax assets	557	543
Property and equipment, including rental equipment	(2,349)	(1,962)
Operating lease liabilities	(210)	(183)
Intangibles	(152)	(166)
Total deferred tax liability	(2,711)	(2,311)
Total net deferred tax liability	$ (2,154)	$ (1,768)