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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
EQM Midstream Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Net carrying value of Convertible Notes	$ 102	$ 105
Estimated fair value of long-term debt	123	130
Senior Notes \| Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying value of total debt	6,500	5,200
Net carrying value of Convertible Notes	$ 5,400	$ 4,500

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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