Derivatives and Risk Management (Schedule of Derivative Instruments Notional Amount, Weighted Average Contract Prices and Fair Value) (Details) bbl in Thousands, Mcf in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / MMBTU $ / bbl Mcf bbl
Financial protection on production - 2022 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	1,297
Fair Value	$ (867)
Financial protection on production - 2022 | Not Designated as Hedging Instrument | Oil
Derivative [Line Items]
Volume | bbl	4,583
Fair Value	$ (83)
Financial protection on production - 2022 | Not Designated as Hedging Instrument | Ethane
Derivative [Line Items]
Volume | bbl	5,932
Fair Value	$ (9)
Financial protection on production - 2022 | Not Designated as Hedging Instrument | Propane
Derivative [Line Items]
Volume | bbl	6,674
Fair Value	$ (80)
Fixed price swaps - 2022 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	806
Average price per MMBtu and Bbls | $ / MMBTU	3.08
Fair Value	$ (486)
Fixed price swaps - 2022 | Not Designated as Hedging Instrument | Oil
Derivative [Line Items]
Volume | bbl	3,203
Average price per MMBtu and Bbls | $ / bbl	53.54
Fair Value	$ (60)
Fixed price swaps - 2022 | Not Designated as Hedging Instrument | Ethane
Derivative [Line Items]
Volume | bbl	5,797
Average price per MMBtu and Bbls | $ / bbl	11.37
Fair Value	$ (8)
Fixed price swaps - 2022 | Not Designated as Hedging Instrument | Propane
Derivative [Line Items]
Volume | bbl	6,369
Average price per MMBtu and Bbls | $ / bbl	31.14
Fair Value	$ (76)
Fixed price swaps - 2022 | Not Designated as Hedging Instrument | Normal Butane
Derivative [Line Items]
Volume | bbl	1,587
Average price per MMBtu and Bbls | $ / bbl	32.86
Fair Value	$ (26)
Fixed price swaps - 2022 | Not Designated as Hedging Instrument | Natural Gasoline
Derivative [Line Items]
Volume | bbl	1,840
Average price per MMBtu and Bbls | $ / bbl	52.85
Fair Value	$ (33)
Two-way costless collars - 2022 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	144
Floor price per MMBtu and Bbls | $ / MMBTU	2.71
Cap price per MMBtu and Bbls | $ / MMBTU	3.14
Fair Value	$ (95)
Two-way costless collars - 2022 | Not Designated as Hedging Instrument | Ethane
Derivative [Line Items]
Volume | bbl	135
Cap price per MMBtu and Bbls | $ / bbl	9.66
Fair Value	$ (1)
Two-way costless collars - 2022 | Not Designated as Hedging Instrument | Ethane | Purchased
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / bbl	7.56
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	347
Cap price per MMBtu and Bbls | $ / MMBTU	2.94
Fair Value	$ (286)
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Natural Gas | Sold
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / MMBTU	2.06
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Natural Gas | Purchased
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / MMBTU	2.52
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Oil
Derivative [Line Items]
Volume | bbl	1,380
Cap price per MMBtu and Bbls | $ / bbl	57.05
Fair Value	$ (23)
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Oil | Sold
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / bbl	39.89
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Oil | Purchased
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / bbl	50.23
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Propane
Derivative [Line Items]
Volume | bbl	305
Average price per MMBtu and Bbls | $ / bbl	0
Cap price per MMBtu and Bbls | $ / bbl	31.92
Fair Value	$ (4)
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Propane | Sold
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / bbl	16.80
Three-way costless collars - 2022 | Not Designated as Hedging Instrument | Propane | Purchased
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / bbl	21.00
Financial protection on production - 2023 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	923
Fair Value	$ (298)
Financial protection on production - 2023 | Not Designated as Hedging Instrument | Oil
Derivative [Line Items]
Volume | bbl	2,114
Fair Value	$ (26)
Fixed Price Swaps - 2023 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	489
Average price per MMBtu and Bbls | $ / MMBTU	3.07
Fair Value	$ (143)
Fixed Price Swaps - 2023 | Not Designated as Hedging Instrument | Oil
Derivative [Line Items]
Volume | bbl	846
Average price per MMBtu and Bbls | $ / bbl	55.98
Fair Value	$ (8)
Fixed Price Swaps - 2023 | Not Designated as Hedging Instrument | Ethane
Derivative [Line Items]
Volume | bbl	432
Average price per MMBtu and Bbls | $ / bbl	11.67
Fair Value	$ 0
Fixed Price Swaps - 2023 | Not Designated as Hedging Instrument | Propane
Derivative [Line Items]
Volume | bbl	518
Average price per MMBtu and Bbls | $ / bbl	33.62
Fair Value	$ (1)
Fixed Price Swaps - 2023 | Not Designated as Hedging Instrument | Normal Butane
Derivative [Line Items]
Volume | bbl	164
Average price per MMBtu and Bbls | $ / bbl	37.84
Fair Value	$ 0
Fixed Price Swaps - 2023 | Not Designated as Hedging Instrument | Natural Gasoline
Derivative [Line Items]
Volume | bbl	157
Average price per MMBtu and Bbls | $ / bbl	58.65
Fair Value	$ (1)
Two-way Costless-collars - 2023 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	219
Floor price per MMBtu and Bbls | $ / MMBTU	3.03
Cap price per MMBtu and Bbls | $ / MMBTU	3.55
Fair Value	$ (19)
Three-way Costless-collars - 2023 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	215
Cap price per MMBtu and Bbls | $ / MMBTU	3.00
Fair Value	$ (136)
Three-way Costless-collars - 2023 | Not Designated as Hedging Instrument | Natural Gas | Sold
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / MMBTU	2.09
Three-way Costless-collars - 2023 | Not Designated as Hedging Instrument | Natural Gas | Purchased
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / MMBTU	2.54
Three-way Costless-collars - 2023 | Not Designated as Hedging Instrument | Oil
Derivative [Line Items]
Volume | bbl	1,268
Average price per MMBtu and Bbls | $ / bbl	0
Cap price per MMBtu and Bbls | $ / bbl	56.12
Fair Value	$ (18)
Three-way Costless-collars - 2023 | Not Designated as Hedging Instrument | Oil | Sold
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / bbl	33.97
Three-way Costless-collars - 2023 | Not Designated as Hedging Instrument | Oil | Purchased
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / bbl	45.51
Financial protection on production - 2024 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	279
Fair Value	$ (40)
Fixed price swaps - 2024 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	224
Average price per MMBtu and Bbls | $ / MMBTU	2.96
Fair Value	$ (39)
Fixed price swaps - 2024 | Not Designated as Hedging Instrument | Oil
Derivative [Line Items]
Volume | bbl	54
Average price per MMBtu and Bbls | $ / bbl	53.15
Fair Value	$ (1)
Two way costless collars - 2024 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	44
Floor price per MMBtu and Bbls | $ / MMBTU	3.07
Cap price per MMBtu and Bbls | $ / MMBTU	3.53
Fair Value	$ 4
Three-way costless collars - 2024 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	11
Cap price per MMBtu and Bbls | $ / MMBTU	3.54
Fair Value	$ (5)
Three-way costless collars - 2024 | Not Designated as Hedging Instrument | Natural Gas | Sold
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / MMBTU	2.25
Three-way costless collars - 2024 | Not Designated as Hedging Instrument | Natural Gas | Purchased
Derivative [Line Items]
Floor price per MMBtu and Bbls | $ / MMBTU	2.80
Basis swaps | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	577
Fair Value	$ 68
Basis Swaps - 2022 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	322
Basis Differential | $ / MMBTU	(0.38)
Fair Value	$ 68
Basis Swaps - 2023 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	200
Basis Differential | $ / MMBTU	(0.45)
Fair Value	$ (1)
Basis Swaps - 2024 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	46
Basis Differential | $ / MMBTU	(0.71)
Fair Value	$ 0
Basis Swaps - 2025 | Not Designated as Hedging Instrument | Natural Gas
Derivative [Line Items]
Volume | Mcf	9
Basis Differential | $ / MMBTU	(0.64)
Fair Value	$ 1
Call options | Natural Gas
Derivative [Line Items]
Volume | Mcf	139
Fair Value	$ (109)
Call Option - 2022 | Natural Gas
Derivative [Line Items]
Volume | Mcf	84
Cap price per MMBtu and Bbls | $ / MMBTU	3.01
Fair Value	$ (67)
Call Option - 2023 | Natural Gas
Derivative [Line Items]
Volume | Mcf	46
Cap price per MMBtu and Bbls | $ / MMBTU	2.94
Fair Value	$ (33)
Call Option - 2024 | Natural Gas
Derivative [Line Items]
Volume | Mcf	9
Cap price per MMBtu and Bbls | $ / MMBTU	3.00
Fair Value	$ (9)
Put Option - 2022 | Natural Gas
Derivative [Line Items]
Volume | Mcf	5
Cap price per MMBtu and Bbls | $ / MMBTU	2.00
Fair Value	$ 0
Storage 2022 | Not Designated as Hedging Instrument
Derivative [Line Items]
Volume | Mcf	3
Fair Value	$ (1)
Purchased Fixed Price Swaps, Storage, 2022 | Not Designated as Hedging Instrument
Derivative [Line Items]
Volume | Mcf	0
Average price per MMBtu and Bbls | $ / MMBTU	2.14
Basis Differential | $ / MMBTU	0
Fair Value	$ 0
Fixed Price Swap, Storage, 2022 | Not Designated as Hedging Instrument
Derivative [Line Items]
Volume | Mcf	2
Average price per MMBtu and Bbls | $ / MMBTU	2.82
Basis Differential | $ / MMBTU	0
Fair Value	$ (1)
Basis Swaps Storage, 2022 | Not Designated as Hedging Instrument
Derivative [Line Items]
Volume | Mcf	1
Average price per MMBtu and Bbls | $ / MMBTU	0
Basis Differential | $ / MMBTU	(0.57)
Fair Value	$ 0