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Contingent Liabilities and Commitments - Commitments Under Contracts (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Long-term Purchase Commitment [Line Items]  
2020 $ 167
2021 142
2022 130
2023 115
2024 112
Thereafter 347
Total 1,013
Other Liabilities 36
Gas Transportation and Storage [Member]  
Long-term Purchase Commitment [Line Items]  
2020 114
2021 94
2022 87
2023 75
2024 76
Thereafter 315
Total 761
Other Liabilities 21
Midstream Services [Member]  
Long-term Purchase Commitment [Line Items]  
2020 53
2021 48
2022 43
2023 40
2024 36
Thereafter 32
Total 252
Other Liabilities $ 15