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v3.20.2

Balance Sheet Components (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Apr. 09, 2020 USD ($) | Mar. 31, 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 |  | $ 12 |  | $ 12 |  |  | $ 6 |  | $ 5
Unbilled Receivables, Current |  | 74 |  | 74 |  |  |  |  | 86
Finite-Lived Intangible Assets, Accumulated Amortization |  | 397 |  | 397 |  |  |  |  | 366
Amortization of Intangible Assets |  | 16 | $ 17 | 31 | $ 33 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 600 |  | $ 600 |  |  |  |  |
Debt Instrument, Covenant Description |  |  |  | 65.00% |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 0.544 |  | 0.544 |  |  |  |  |
Short-term debt |  | $ 150 |  | $ 150 |  | $ 150 |  |  | 0
Line of Credit Facility, Remaining Borrowing Capacity |  | 500 |  | 500 |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | 220 | $ 500 | 220 | 500 |  |  |  |
Letters of credit issued |  | 46 |  | 46 |  |  |  |  |
Authorized Short-Term Debt |  | 900 |  | 900 |  |  |  |  |
Long-term Debt, Current Maturities |  | 140 |  | 140 |  |  |  |  | $ 0
Proceeds from Issuance of Long-term Debt |  |  |  | 319 | $ 200 |  |  |  |
Long-term Pollution Control Bond |  |  |  |  |  |  |  | $ 119 |
Proceeds from Issuance of Debt | $ 200 |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  | $ 0 |  | $ 0 |  |  |  |  |
Member one [Member] |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Long-term Pollution Control Bond |  |  |  |  |  |  |  | 98 |
Member 2 [Member] |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Long-term Pollution Control Bond |  |  |  |  |  |  |  | $ 21 |

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