Long-Term Debt and Credit Agreements - Cimarex Senior Notes (Details) - Senior Notes	Oct. 01, 2021 USD ($)
Debt Instrument [Line Items]
Face Value	$ 2,000,000,000
Fair Value	2,196,000,000
4.375% senior notes due June 1, 2024
Debt Instrument [Line Items]
Face Value	750,000,000
Fair Value	809,000,000
3.90% senior notes due May 15, 2027
Debt Instrument [Line Items]
Face Value	750,000,000
Fair Value	823,000,000
4.375% senior notes due March 15, 2029
Debt Instrument [Line Items]
Face Value	500,000,000
Fair Value	$ 564,000,000