XML 46 R37.htm IDEA: XBRL DOCUMENT v3.22.1
Risk Management Fair values of price risk management assets and liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Current Assets, Commodity Contracts:    
Electricity $ 35 $ 16
Natural gas 229 86
Total current derivative assets 264 102
Noncurrent Assets, Commodity Contracts: [Abstract]    
Commodity Contract Asset, Noncurrent, Electricity 1 1
Commodity Contract Asset, Noncurrent, Natural Gas 63 34
Derivative Asset, Noncurrent 64 35
Total derivative assets 328 137
Current Liabilities, Commodity Contracts: [Abstract]    
Electricity 51 36
Natural gas 9 11
Total current derivative liabilities 60 47
Noncurrent Liabilities, Commodity Contracts: [Abstract]    
Electricity 71 87
Natural gas 1 3
Total noncurrent derivative liabilities 72 90
Total derivative liabilities $ 132 $ 137