Assets and Liabilities with Recurring Fair Value Measurements (Tables)
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6 Months Ended |
Jun. 30, 2019 |
| Fair Value Disclosures [Abstract] |
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| Fair Value, Measurement Inputs, Disclosure |
The following tables present our financial assets and liabilities that were accounted for at fair value on a recurring basis as of June 30, 2019 and December 31, 2018, by level within the fair value hierarchy: | | | | | | | | | | | | | | | | | | Assets and Liabilities with Recurring Fair Value Measures as of June 30, 2019 | | Level 1 | | Level 2 | | Level 3 | | Total | | (in millions) | Assets: | | | | | | | | Cash equivalents(1) | $ | 165 |
| | $ | — |
| | $ | — |
| | $ | 165 |
| Commodity instruments: | | | | | | | | Commodity exchange traded derivatives contracts | 1,089 |
| | — |
| | — |
| | 1,089 |
| Commodity forward contracts(2) | — |
| | 350 |
| | 322 |
| | 672 |
| Interest rate hedging instruments | — |
| | 6 |
| | — |
| | 6 |
| Effect of netting and allocation of collateral(3)(4) | (1,089 | ) | | (243 | ) | | (20 | ) | | (1,352 | ) | Total assets | $ | 165 |
| | $ | 113 |
| | $ | 302 |
| | $ | 580 |
| Liabilities: | | | | | | | | Commodity instruments: | | | | | | | | Commodity exchange traded derivatives contracts | $ | 1,179 |
| | $ | — |
| | $ | — |
| | $ | 1,179 |
| Commodity forward contracts(2) | — |
| | 474 |
| | 96 |
| | 570 |
| Interest rate hedging instruments | — |
| | 33 |
| | — |
| | 33 |
| Effect of netting and allocation of collateral(3)(4) | (1,179 | ) | | (298 | ) | | (21 | ) | | (1,498 | ) | Total liabilities | $ | — |
| | $ | 209 |
| | $ | 75 |
| | $ | 284 |
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| | | | | | | | | | | | | | | | | | Assets and Liabilities with Recurring Fair Value Measures as of December 31, 2018 | | Level 1 | | Level 2 | | Level 3 | | Total | | (in millions) | Assets: | | | | | | | | Cash equivalents(1) | $ | 168 |
| | $ | — |
| | $ | — |
| | $ | 168 |
| Commodity instruments: | | | | | | | | Commodity exchange traded derivatives contracts | 933 |
| | — |
| | — |
| | 933 |
| Commodity forward contracts(2) | — |
| | 338 |
| | 212 |
| | 550 |
| Interest rate hedging instruments | — |
| | 40 |
| | — |
| | 40 |
| Effect of netting and allocation of collateral(3)(4) | (933 | ) | | (262 | ) | | (26 | ) | | (1,221 | ) | Total assets | $ | 168 |
| | $ | 116 |
| | $ | 186 |
| | $ | 470 |
| Liabilities: | | | | | | | | Commodity instruments: | | | | | | | | Commodity exchange traded derivatives contracts | $ | 932 |
| | $ | — |
| | $ | — |
| | $ | 932 |
| Commodity forward contracts(2) | — |
| | 549 |
| | 220 |
| | 769 |
| Interest rate hedging instruments | — |
| | 10 |
| | — |
| | 10 |
| Effect of netting and allocation of collateral(3)(4) | (932 | ) | | (310 | ) | | (26 | ) | | (1,268 | ) | Total liabilities | $ | — |
| | $ | 249 |
| | $ | 194 |
| | $ | 443 |
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___________ | | (1) | At June 30, 2019 and December 31, 2018, we had cash equivalents of $16 million and $23 million included in cash and cash equivalents and $149 million and $145 million included in restricted cash, respectively. |
| | (2) | Includes OTC swaps and options. |
| | (3) | We offset fair value amounts recognized for derivative instruments executed with the same counterparty under a master netting arrangement for financial statement presentation; therefore, amounts recognized for the right to reclaim, or the obligation to return, cash collateral are presented net with the corresponding derivative instrument fair values. See Note 8 for further discussion of our derivative instruments subject to master netting arrangements. |
| | (4) | Cash collateral posted with (received from) counterparties allocated to level 1, level 2 and level 3 derivative instruments totaled $90 million, $55 million and $1 million, respectively, at June 30, 2019. Cash collateral posted with (received from) counterparties allocated to level 1, level 2 and level 3 derivative instruments totaled $(1) million, $48 million and nil, respectively, at December 31, 2018. |
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| Fair Value Inputs, Assets, Quantitative Information |
The following table presents quantitative information for the unobservable inputs used in our most significant level 3 fair value measurements at June 30, 2019 and December 31, 2018: | | | | | | | | | | | | | | | | | | | Quantitative Information about Level 3 Fair Value Measurements | | | | June 30, 2019 | | | | Fair Value, Net Asset | | | | Significant Unobservable | | | | | | | | (Liability) | | Valuation Technique | | Input | | Range | | | (in millions) | | | | | | | | | | Power Contracts(1) | | $ | 190 |
| | Discounted cash flow | | Market price (per MWh) | | $ | 7.09 |
| — | $123.34 | /MWh | Power Congestion Products | | $ | 18 |
| | Discounted cash flow | | Market price (per MWh) | | $ | (8.63 | ) | — | $11.48 | /MWh | Natural Gas Contracts | | $ | 6 |
| | Discounted cash flow | | Market price (per MMBtu) | | $ | 0.61 |
| — | $9.75 | /MMBtu | | | | | | | | | | | | | | | December 31, 2018 | | | | Fair Value, Net Asset | | | | Significant Unobservable | | | | | | | | (Liability) | | Valuation Technique | | Input | | Range | | | (in millions) | | | | | | | | | | Power Contracts(1) | | $ | 36 |
| | Discounted cash flow | | Market price (per MWh) | | $ | 2.12 |
| — | $227.98 | /MWh | Power Congestion Products | | $ | 26 |
| | Discounted cash flow | | Market price (per MWh) | | $ | (11.71 | ) | — | $11.88 | /MWh | Natural Gas Contracts | | $ | (73 | ) | | Discounted cash flow | | Market price (per MMBtu) | | $ | 0.75 |
| — | $8.87 | /MMBtu |
___________ | | (1) | Power contracts include power and heat rate instruments classified as level 3 in the fair value hierarchy. |
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
The following table sets forth a reconciliation of changes in the fair value of our net derivative assets (liabilities) classified as level 3 in the fair value hierarchy for the periods indicated (in millions): | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | 2019 | | 2018 | | 2019 | | 2018 | Balance, beginning of period | | $ | 105 |
| | $ | 129 |
| | $ | (8 | ) | | $ | 197 |
| Realized and mark-to-market gains (losses): | | | | | | | | | Included in net income (loss): | | | | | | | | | Included in operating revenues(1) | | 152 |
| | 31 |
| | 197 |
| | (28 | ) | Included in fuel and purchased energy expense(2) | | 1 |
| | 18 |
| | 2 |
| | 15 |
| Change in collateral | | (1 | ) | | 1 |
| | 1 |
| | (1 | ) | Purchases, Issuances and settlements: | | | | | | | | | Purchases | | 1 |
| | 5 |
| | 3 |
| | 9 |
| Issuances | | (1 | ) | | — |
| | (1 | ) | | — |
| Settlements | | (35 | ) | | (42 | ) | | 28 |
| | (53 | ) | Transfers in and/or out of level 3(3): | | | | | | | | | Transfers into level 3(4) | | 6 |
| | (1 | ) | | 7 |
| | (1 | ) | Transfers out of level 3(5) | | (1 | ) | | (10 | ) | | (2 | ) | | (7 | ) | Balance, end of period | | $ | 227 |
| | $ | 131 |
| | $ | 227 |
| | $ | 131 |
| Change in unrealized gains (losses) relating to instruments still held at end of period | | $ | 153 |
| | $ | 49 |
| | $ | 199 |
| | $ | (13 | ) |
___________ | | (1) | For power contracts and other power-related products, included on our Consolidated Condensed Statements of Operations. |
| | (2) | For natural gas and power contracts, swaps and options, included on our Consolidated Condensed Statements of Operations. |
| | (3) | We transfer amounts among levels of the fair value hierarchy as of the end of each period. There were no transfers into or out of level 1 for each of the three and six months ended June 30, 2019 and 2018. |
| | (4) | We had $6 million in gains and $(1) million in losses transferred out of level 2 into level 3 for the three months ended June 30, 2019 and 2018, respectively, and $7 million in gains and $(1) million in losses transferred out of level 2 into level 3 for the six months ended June 30, 2019 and 2018, respectively, due to changes in market liquidity in various power markets. |
| | (5) | We had $1 million and $10 million in gains transferred out of level 3 into level 2 for the three months ended June 30, 2019 and 2018, respectively, and $2 million and $7 million in gains transferred out of level 3 into level 2 for the six months ended June 30, 2019 and 2018, respectively, due to changes in market liquidity in various power markets. |
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