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Leases Maturities of Lease Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Leases [Abstract] |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | $ 8 | $ 4
Lessee, Operating Lease, Liability, Payments, Due Year Two | 8 |
Finance Lease, Liability, Payments, Due Year Two | 16 |
Finance Lease, Liability, Payments, Due Year Two | 16 |
Lessee, Operating Lease, Liability, Payments, Due Year Three | 8 |
Finance Lease, Liability, Payments, Due Year Three | 16 |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 8 |
Finance Lease, Liability, Payments, Due Year Four | 14 |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 7 |
Finance Lease, Liability, Payments, Due Year Five | 14 |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 46 |
Finance Lease, Liability, Payments, Due after Year Five | 235 |
Lessee, Operating Lease, Liability, Payments, Due | 85 |
Finance Lease, Liability, Payment, Due | 311 |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (34) |
Finance Lease, Liability, Undiscounted Excess Amount | (160) |
Operating Lease, Liability | 51 |
Finance Lease, Liability | $ 151 |

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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 undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest fiscal year. + 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 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year. + 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 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year. + 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 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year. + 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 + Details
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