Leases - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) store	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) store
Operating Leased Assets [Line Items]
Office real estate optimization charges	$ 117		$ 46	$ 117	$ 0
Number of stores, planned closure | store					900
Store impairment charges			0	$ 0	$ 1,358
Operating lease right-of-use asset
Operating Leased Assets [Line Items]
Office real estate optimization charges	71		$ 20
Pharmacy & Consumer Wellness
Operating Leased Assets [Line Items]
Number of stores, planned closure | store		900			900
Number of stores, annual planned closures for closure period | store		300
Store impairment charges		$ 1,400			$ 1,400
Pharmacy & Consumer Wellness | Operating lease right-of-use asset
Operating Leased Assets [Line Items]
Store impairment charges		1,100
Operating lease, right-of-use asset, fair value		356			356
Distribution centers and Corporate offices | Minimum
Operating Leased Assets [Line Items]
Operating lease term (in years)			15 years
Finance lease term (in years)			15 years
Distribution centers and Corporate offices | Maximum
Operating Leased Assets [Line Items]
Operating lease term (in years)			25 years
Finance lease term (in years)			25 years
Equipment | Minimum
Operating Leased Assets [Line Items]
Operating lease term (in years)			3 years
Finance lease term (in years)			3 years
Equipment | Maximum
Operating Leased Assets [Line Items]
Operating lease term (in years)			10 years
Finance lease term (in years)			10 years
Property and equipment
Operating Leased Assets [Line Items]
Office real estate optimization charges	$ 44		$ 18
Property and equipment | Pharmacy & Consumer Wellness
Operating Leased Assets [Line Items]
Store impairment charges		261
Property and equipment, fair value		$ 185			$ 185