XML 69 R58.htm IDEA: XBRL DOCUMENT v3.20.2
Fair Value of Financial Instruments - Assets and Liabilities Measured and Recorded at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in securities (classified within other current and non-current assets) $ 15 $ 20
Other trust fund investments:    
U.S. government and federal agency obligations 1 1
Measured using net asset value practical expedient:    
Total assets 1,744 1,993
Derivative liabilities:    
Derivative liabilities 813 1,103
Commodity contracts    
Derivative assets:    
Derivative assets 893 1,170
Derivative liabilities:    
Derivative liabilities 813 1,103
Cash and cash equivalents    
Nuclear trust fund investments:    
Nuclear trust fund investments 25 17
U.S. government and federal agency obligations    
Nuclear trust fund investments:    
Nuclear trust fund investments 49 68
Federal agency mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 92 100
Commercial mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 38 29
Corporate debt securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 144 109
Equity securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 402 388
Measured using net asset value practical expedient:    
Equity contracts 7 8
Foreign government fixed income securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 6 5
Equity securities — nuclear trust fund investments    
Measured using net asset value practical expedient:    
Equity contracts 72 78
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in securities (classified within other current and non-current assets) 0 0
Other trust fund investments:    
U.S. government and federal agency obligations 1 1
Measured using net asset value practical expedient:    
Total assets 550 558
Derivative liabilities:    
Derivative liabilities 70 143
Level 1 | Commodity contracts    
Derivative assets:    
Derivative assets 74 84
Derivative liabilities:    
Derivative liabilities 70 143
Level 1 | Cash and cash equivalents    
Nuclear trust fund investments:    
Nuclear trust fund investments 25 17
Level 1 | U.S. government and federal agency obligations    
Nuclear trust fund investments:    
Nuclear trust fund investments 48 68
Level 1 | Federal agency mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 1 | Commercial mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 1 | Corporate debt securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 1 | Equity securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 402 388
Level 1 | Foreign government fixed income securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in securities (classified within other current and non-current assets) 15 20
Other trust fund investments:    
U.S. government and federal agency obligations 0 0
Measured using net asset value practical expedient:    
Total assets 888 1,156
Derivative liabilities:    
Derivative liabilities 568 805
Level 2 | Commodity contracts    
Derivative assets:    
Derivative assets 592 893
Derivative liabilities:    
Derivative liabilities 568 805
Level 2 | Cash and cash equivalents    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 2 | U.S. government and federal agency obligations    
Nuclear trust fund investments:    
Nuclear trust fund investments 1 0
Level 2 | Federal agency mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 92 100
Level 2 | Commercial mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 38 29
Level 2 | Corporate debt securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 144 109
Level 2 | Equity securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 2 | Foreign government fixed income securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 6 5
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in securities (classified within other current and non-current assets) 0 0
Other trust fund investments:    
U.S. government and federal agency obligations 0 0
Measured using net asset value practical expedient:    
Total assets 227 193
Derivative liabilities:    
Derivative liabilities 175 155
Level 3 | Commodity contracts    
Derivative assets:    
Derivative assets 227 193
Derivative liabilities:    
Derivative liabilities 175 155
Level 3 | Cash and cash equivalents    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 3 | U.S. government and federal agency obligations    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 3 | Federal agency mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 3 | Commercial mortgage-backed securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 3 | Corporate debt securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 3 | Equity securities    
Nuclear trust fund investments:    
Nuclear trust fund investments 0 0
Level 3 | Foreign government fixed income securities    
Nuclear trust fund investments:    
Nuclear trust fund investments $ 0 $ 0