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Balance Sheet Components (Details) |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 15, 2019 USD ($) | Oct. 25, 2019 USD ($) | Apr. 12, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 0 |  | $ 0 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 350,000,000 |  | 350,000,000 |  | $ 302,000,000
Amortization of Intangible Assets |  |  |  | 16,000,000 | $ 16,000,000 | $ 49,000,000 | $ 43,000,000 |
Asset Retirement Obligation, Revision of Estimate |  |  |  | $ 69,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 500,000,000
Debt Instrument, Covenant Description |  |  |  |  |  | 65.00% |  |
Ratio of Indebtedness to Net Capital |  |  |  | 0.502 |  | 0.502 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | $ 500,000,000 |  | $ 500,000,000 |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | 220,000,000 |  | 220,000,000 |  |
Letters of credit issued |  |  |  | 60,000,000 |  | 60,000,000 |  |
Authorized Short-Term Debt |  |  |  | 900,000,000 |  | 900,000,000 |  |
Long-term Debt, Current Maturities |  |  |  | 50,000,000 |  | 50,000,000 |  | $ 300,000,000
Proceeds from Issuance of Debt |  | $ 270,000,000 |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 160,000,000 | $ 110,000,000 | $ 200,000,000 |  |  | 200,000,000 | $ 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  |  |  | 2,000,000 |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 0 |  | $ 0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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