Leases - Schedule of Consolidated Balance Sheet Related To Leases (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Asset impairment charges		$ 1,500	$ 12	$ 12
Net of accumulated amortization					$ 11	$ 8
Home Solutions
Lessee, Lease, Description [Line Items]
Asset impairment charges	$ 5	3
Corporate
Lessee, Lease, Description [Line Items]
Asset impairment charges		$ 2