Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax provision		$ 57	$ 85	$ 109
State and local income taxes, net of U.S. federal tax benefit		11	19	12
Impact of foreign operations		1	2
Interest on installment sales, net of U.S. federal tax benefit		4	3	3
Interest on installment sales adjustment				(5)
Effects of the TCJ Act			(4)	(133)
Tax accounting method change		(18)
Other		2		(2)
Total provision for income taxes	[1]	$ 57	$ 105	$ (16)

[1] On December 22, 2017, the United States enacted tax reform legislation, the TCJ Act, resulting in significant modifications to existing law which resulted in a reduction in income tax expense for the year ended December 31, 2017. See Note 17: Income Taxes for additional information.