v3.7.0.1

Use of Collateral (Tables) | 3 Months Ended
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Mar. 31, 2017
Use of Collateral [Abstract] |
Schedule of Collateral | The table below summarizes the balances outstanding under margin deposits, natural gas and power prepayments, and exposure under letters of credit and first priority liens for commodity procurement and risk management activities as of March 31, 2017 and December 31, 2016 (in millions):
| March 31, 2017 |  | December 31, 2016
Margin deposits(1) | $ | 284 |  |  | $ | 350 |
Natural gas and power prepayments | 24 |  |  | 25 |
Total margin deposits and natural gas and power prepayments with our counterparties(2) | $ | 308 |  |  | $ | 375 |
Letters of credit issued | $ | 738 |  |  | $ | 798 |
First priority liens under power and natural gas agreements | 217 |  |  | 206 |
First priority liens under interest rate hedging instruments | 53 |  |  | 55 |
Total letters of credit and first priority liens with our counterparties | $ | 1,008 |  |  | $ | 1,059 |
Margin deposits posted with us by our counterparties(1)(3) | $ | 9 |  |  | $ | 16 |
Letters of credit posted with us by our counterparties | 37 |  |  | 43 |
Total margin deposits and letters of credit posted with us by our counterparties | $ | 46 |  |  | $ | 59 |
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(1) | Balances are subject to master netting arrangements and presented on a gross basis on our Consolidated Condensed Balance Sheets. We do not offset fair value amounts recognized for derivative instruments executed with the same counterparty under a master netting arrangement for financial statement presentation, and we do not offset amounts recognized for the right to reclaim, or the obligation to return, cash collateral with corresponding derivative instrument fair values. See Note 6 for further discussion of our derivative instruments subject to master netting arrangements.
(2) | At March 31, 2017 and December 31, 2016, $298 million and $366 million, respectively, were included in margin deposits and other prepaid expense and $10 million and $9 million, respectively, were included in other assets on our Consolidated Condensed Balance Sheets.
(3) | Included in other current liabilities on our Consolidated Condensed Balance Sheets.

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