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Investments (Expected Sale of SoCore Energy) (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Regulated Operations [Abstract] |
Impairment charge | $ 66
Impairment charge, net of tax | 48
Assets: |
Cash and cash equivalents | 18
Short-term restricted cash | 25
Receivables | 6
Non-utility property, plant and equipment1 | 203
Other assets | 18
Total assets of business held for sale | 270
Liabilities: |
Accounts payable | 1
Accrued liabilities | 4
Debt obligations | 82
Other liabilities | 27
Noncontrolling interest (NCI) | 28
Total liabilities and NCI of business held for sale | $ 142

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