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Commitment, Contingencies And Guarantees: Purchase Commitment (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
MMBTU
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long-term Purchase Commitment [Line Items]      
2021 12,588,974    
2022 12,012,500    
2023 8,220,000    
2024 4,560,000    
2025 0    
Thereafter 0    
Natural Gas, Distribution      
Long-term Purchase Commitment [Line Items]      
Natural Gas Purchases | $ $ 61 $ 25 $ 7
El Paso - Bondad Station      
Long-term Purchase Commitment [Line Items]      
2021 31,000    
2022 0    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Kern River - Opal      
Long-term Purchase Commitment [Line Items]      
2021 9,300    
2022 0    
2023 0    
2024 0    
2025 0    
Thereafter 0    
El Paso - San Juan Basin      
Long-term Purchase Commitment [Line Items]      
2021 182,550    
2022 0    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Enable East Pipeline      
Long-term Purchase Commitment [Line Items]      
2021 1,825,000    
2022 450,000    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Northern Natural Gas - Demarc      
Long-term Purchase Commitment [Line Items]      
2021 1,614    
2022 0    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Northern Natural Gas - Ventura      
Long-term Purchase Commitment [Line Items]      
2021 1,810,000    
2022 1,840,000    
2023 1,820,000    
2024 0    
2025 0    
Thereafter 0    
Northwest Pipeline - Wyoming      
Long-term Purchase Commitment [Line Items]      
2021 1,531,700    
2022 1,510,000    
2023 910,000    
2024 0    
2025 0    
Thereafter 0    
ONEOK - Oklahoma      
Long-term Purchase Commitment [Line Items]      
2021 5,475,000    
2022 5,475,000    
2023 5,490,000    
2024 4,560,000    
2025 0    
Thereafter 0    
Southern Star Central Gas Pipeline      
Long-term Purchase Commitment [Line Items]      
2021 113,130    
2022 0    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Panhandle Eastern Pipe Line      
Long-term Purchase Commitment [Line Items]      
2021 1,609,680    
2022 2,737,500    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Gas Utilities      
Long-term Purchase Commitment [Line Items]      
Term of Evergreen Contracts 60 days    
Maximum      
Long-term Purchase Commitment [Line Items]      
We maintain natural gas supply contracts with several vendors that generally cover a period up to: 1 year