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Leases Leases - Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets and Liabilities, Lessee [Abstract] |  |
Total lease assets | $ 267 |
Operating lease liability | 243 | $ 278
Finance lease liability | 57 |
Total lease liabilities | 300 |
Other assets [Member] |  |
Assets and Liabilities, Lessee [Abstract] |  |
Operating lease assets | 215 |
Finance lease assets | 52 |
Other liabilities [Member] |  |
Assets and Liabilities, Lessee [Abstract] |  |
Operating lease liability | 243 |
Long-term debt [Member] |  |
Assets and Liabilities, Lessee [Abstract] |  |
Finance lease liability | $ 57 |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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