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v3.20.1

Balance Sheet Components (Details) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Apr. 09, 2020 USD ($) | Mar. 11, 2020 USD ($) | Dec. 31, 2019 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 6,000,000 |  |  |  | $ 5,000,000
Unbilled Receivables, Current | 78,000,000 |  |  |  | 86,000,000
Finite-Lived Intangible Assets, Accumulated Amortization | 381,000,000 |  |  |  | 366,000,000
Amortization of Intangible Assets | $ 15,000,000 | $ 16,000,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 500,000,000
Debt Instrument, Covenant Description | 65.00% |  |  |  |
Ratio of Indebtedness to Net Capital | 0.504 |  |  |  |
Short-term debt | $ 20,000,000 |  |  |  | 0
Line of Credit Facility, Remaining Borrowing Capacity | 480,000,000 |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 220,000,000 |  |  |  |
Letters of credit issued | 51,000,000 |  |  |  |
Authorized Short-Term Debt | 900,000,000 |  |  |  |
Long-term Debt, Current Maturities | 140,000,000 |  |  |  | $ 0
Proceeds from Issuance of Long-term Debt | 119,000,000 | $ 0 |  |  |
Long-term Pollution Control Bond |  |  |  | $ 119,000,000 |
Letter of Credit [Member] |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Short-term debt | $ 20,000,000 |  |  |  |
Member one [Member] |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Long-term Pollution Control Bond |  |  |  | 98,000,000 |
Member 2 [Member] |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Long-term Pollution Control Bond |  |  |  | $ 21,000,000 |
Subsequent Event [Member] |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 150,000,000 |  |

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