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Leases - Additional (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) lease | Jan. 23, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Lease terms | 12 months | 12 months |
Operating lease expense | $ 72 | $ 134 |
Lease liabilities reduced by cash paid | 68 | 131 |
ROU assets from new operating leases in exchange for lease liability |  | 59 |
Liability from new operating leases |  | 59 |
Operating leases not yet commenced |  | $ 362 |
Operating leases not yet commenced, number of significant leases executed | lease |  | 3 |
ROU assets acquired | 910 | $ 910 |
Lease liability acquired | $ 1,033 | $ 1,033 |
Weighted average remaining lease term | 6 years 10 months 24 days | 6 years 10 months 24 days |
Weighted-average discount rate for operating leases | 3.80% | 3.80% |
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease terms | 5 years | 5 years |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease terms | 16 years | 16 years |
WellCare Health Plans, Inc. |  |  |
Lessee, Lease, Description [Line Items] |  |  |
ROU assets acquired |  |  | $ 300
Lease liability acquired |  |  | $ 300

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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