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Leases - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease expense |  | $ 123 | $ 68 | $ 257 | $ 202 |
Lease liabilities reduced by cash paid |  | 136 |  | 274 |  |
ROU assets from new operating leases in exchange for lease liability |  | 2,396 |  | 2,504 |  |
Increase in operating lease liabilities |  | $ 2,396 |  | 2,504 |  |
Operating leases not yet commenced |  |  |  | $ 43 |  |
Weighted average remaining lease term |  | 21 years 4 months 24 days |  | 21 years 4 months 24 days |  | 9 years 2 months 12 days
Weighted-average discount rate for operating leases |  | 5.70% |  | 5.70% |  |
Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating leases, not yet commenced, lease term |  | 2 years |  | 2 years |  |
Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating leases, not yet commenced, lease term |  | 9 years |  | 9 years |  |
Circle Health |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Acquisition, interests acquired | 60.00% |  |  |  |  |
ROU assets from new operating leases in exchange for lease liability | $ 2,351 |  |  |  |  |
Increase in operating lease liabilities | $ 2,351 |  |  |  |  |
Weighted average remaining lease term |  | 28 years 10 months 24 days |  | 28 years 10 months 24 days |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of increase (decrease) in obligation for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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