v3.19.2
Use of Collateral (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Margin deposits [1] $ 373 $ 343
Natural gas and power prepayments 34 31
Total margin deposits and natural gas and power prepayments with our counterparties [2] 407 374
Letters of credit issued 900 1,166
First priority liens under power and natural gas agreements 42 92
First priority liens under interest rate hedging instruments 29 10
Total letters of credit and first priority liens with our counterparties 971 1,268
Margin deposits held by us posted by our counterparties [1],[3] 85 52
Letters of credit posted with us by our counterparties 31 27
Total margin deposits and letters of credit posted with us by our counterparties 116 79
Current and Non-current Derivative Assets and Liabilities [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total margin deposits and natural gas and power prepayments with our counterparties [2] 162 79
Margin deposits held by us posted by our counterparties 16 32
Other Current Liabilities [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Margin deposits held by us posted by our counterparties 28 20
Prepaid Expenses and Other Current Assets [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total margin deposits and natural gas and power prepayments with our counterparties [2] 237 286
Other Assets [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total margin deposits and natural gas and power prepayments with our counterparties [2] 8 9
Other Noncurrent Liabilities [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Margin deposits held by us posted by our counterparties $ 41 $ 0
[1] 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.
[2] At June 30, 2019 and December 31, 2018, $162 million and $79 million, respectively, were included in current and long-term derivative assets and liabilities, $237 million and $286 million, respectively, were included in margin deposits and other prepaid expense and $8 million and $9 million, respectively, were included in other assets on our Consolidated Condensed Balance Sheets.
[3] At June 30, 2019 and December 31, 2018, $16 million and $32 million, respectively, were included in current and long-term derivative assets and liabilities, $28 million and $20 million, respectively, were included in other current liabilities and $41 million and nil, respectively, were included in other long-term liabilities on our Consolidated Condensed Balance Sheets.