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v3.8.0.1

Revenue (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Revenues over the remaining terms of the related contacts | $ 2,000
Renewable Energy Sales [Member] |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Revenue from contract with customer | 12
Natural Gas Transportation Services [Member] |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Revenue from contract with customer | 55
Customer Contracts [Member] |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |
Accounts receivable balances related to contracts with customers | $ 23

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