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Leases - Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets and Liabilities, Lessee [Abstract] |  |
Total lease assets | $ 274 |
Operating lease liabilities | 243 | $ 278
Finance lease liabilities | 61 |
Total lease liabilities | $ 304 |
Minimum [Member] |  |
Lessee, Operating Lease, Renewal Term | 1 year |
Maximum [Member] |  |
Lessee, Operating Lease, Renewal Term | 20 years |
Other assets [Member] |  |
Assets and Liabilities, Lessee [Abstract] |  |
Operating lease assets | $ 220 |
Finance lease assets | 54 |
Other liabilities [Member] |  |
Assets and Liabilities, Lessee [Abstract] |  |
Operating lease liabilities | 243 |
Long-term Debt [Member] |  |
Assets and Liabilities, Lessee [Abstract] |  |
Finance lease liabilities | $ 61 |

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- Definition Total leased assets + References No definition available. + Details
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- Definition Total lease liabilities + References No definition available. + Details
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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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- Definition Term of lessee's operating lease renewal, 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=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of lessee's right to use underlying asset under operating 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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