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Leases - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) store | Mar. 31, 2019 USD ($) store | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) store | Sep. 30, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Sale leaseback transaction, net proceeds, investing activities | $ 0 |  | $ 0 | $ 5 | $ 0
Store rationalization charges | $ 96 |  | $ 0 | $ 231 | $ 0
Building | Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  |  |  | 15 years |
Building | Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  |  |  | 25 years |
Equipment and other assets | Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  |  |  | 3 years |
Equipment and other assets | Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  |  |  | 10 years |
Retail Long-Term Care Segment |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of under performing stores | store | 22 | 46 |  | 22 |
Store rationalization charges | $ 96 | $ 135 |  |  |

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- Definition Amount of gain (loss) on sale and leaseback transaction from transfer of asset accounted for as sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888430&loc=SL77919786-209982 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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