Leases - Narrative (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) store	Mar. 31, 2019 USD ($) store	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Proceeds from sale-leaseback transactions			$ 101,000,000	$ 5,000,000	$ 0
Gains from sale-leaseback transactions			3,000,000	0
Store rationalization charges			$ 0	$ 231,000,000	$ 0
Retail/ LTC
Operating Leased Assets [Line Items]
Number of under performing stores, planned closure | store	22	46
Store rationalization charges	$ 96,000,000	$ 135,000,000
Distribution centers and Corporate Offices | Minimum
Operating Leased Assets [Line Items]
Lease term			15 years
Distribution centers and Corporate Offices | Maximum
Operating Leased Assets [Line Items]
Lease term			25 years
Equipment | Minimum
Operating Leased Assets [Line Items]
Lease term			3 years
Equipment | Maximum
Operating Leased Assets [Line Items]
Lease term			10 years