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v3.19.3.a.u2

Capitalization (Details 1) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Capitalization [Line Items] |  |
Finance lease obligations | $ 60 | $ 73
Unamortized debt premiums (discounts) | (33) | (39)
Unamortized debt issuance costs | (103) | (95)
Unamortized fair value adjustments | 8 | 10
Currently payable long-term debt | (380) | (503)
Total long-term debt and other long-term obligations | 19,618 | 17,751
FMBs and secured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
FMBs and secured notes - fixed rate | $ 4,741 | 4,355
FMBs and secured notes - fixed rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 1.726% |
FMBs and secured notes - fixed rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 8.25% |
Unsecured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Unsecured debt | $ 14,575 | 13,450
Unsecured notes - fixed rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.85% |
Unsecured notes - fixed rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 7.375% |
Unsecured notes - variable rate |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.48% |
Unsecured debt | $ 750 | $ 500

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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