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Leases Lease-Related Assets and Liabilities (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finance Lease, Right of Use Asset, Accumulated Depreciation | $ 372,000,000 |
Operating lease right-of-use assets | 1,508,000,000 | $ 0
Finance lease right-of-use asset | 890,000,000 |
Less allowance for depreciation and amortization | 9,875,000,000 | 9,731,000,000
Total lease assets | 2,398,000,000 |
Current operating lease liabilities | 361,000,000 | 0
Finance lease, current maturities of long-term debt | 85,000,000 |
Noncurrent operating lease liabilities | 1,150,000,000 | $ 0
Finance lease, long-term debt less current maturities | 630,000,000 |
Total lease liabilities | 2,226,000,000 |
Finance Lease |  |
Finance lease, current maturities of long-term debt | 85,000,000 |
Finance lease, long-term debt less current maturities | $ 630,000,000 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + 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 (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + 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 (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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