Derivatives and Risk Management (Schedule of Derivative Instruments Notional Amount, Weighted Average Contract Prices and Fair Value) (Details) - Not Designated as Hedging Instrument MBbls in Thousands, Bcf in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) $ / MMBTU $ / bbl Bcf MBbls
Financial protection on production- 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	258
Fair value	$ 39
Financial protection on production- 2023 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	1,171
Fair value	$ (26)
Fixed Price Swaps - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	179
Weighted average price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.28
Fair value	$ 49
Fixed Price Swaps - 2023 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	733
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	67.34
Fair value	$ (15)
Fixed Price Swaps - 2023 | Ethane
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	2,254
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	10.99
Fair value	$ (1)
Fixed Price Swaps - 2023 | Propane
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	1,782
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	30.44
Fair value	$ (1)
Fixed Price Swaps - 2023 | Normal Butane
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	198
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	40.96
Fair value	$ 1
Fixed Price Swaps - 2023 | Natural Gasoline
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	171
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	63.74
Fair value	$ (1)
Two Way Costless Collars - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	32
Fair value	$ 1
Two Way Costless Collars - 2023 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	147
Fair value	$ (1)
Two Way Costless Collars - 2023 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.29
Two Way Costless Collars - 2023 Sold Calls | Oil
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / bbl	80.58
Three Way Costless Collars - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	47
Fair value	$ (11)
Three Way Costless Collars - 2023 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	291
Fair value	$ (10)
Three Way Costless Collars - 2023 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.91
Three Way Costless Collars - 2023 Sold Calls | Oil
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / bbl	55.96
Financial protection on production - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	649
Fair value	$ 72
Financial protection on production - 2024 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	2,083
Fair value	$ (17)
Fixed Price Swaps - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	528
Weighted average price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.54
Fair value	$ 82
Fixed Price Swaps - 2024 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	1,571
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	71.06
Fair value	$ (15)
Fixed Price Swaps - 2024 | Ethane
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	3,429
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	10.84
Fair value	$ 0
Fixed Price Swaps - 2024 | Propane
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	3,254
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	31.78
Fair value	$ 3
Fixed Price Swaps - 2024 | Normal Butane
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	329
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	40.74
Fair value	$ 1
Fixed Price Swaps - 2024 | Natural Gasoline
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	329
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	64.37
Fair value	$ (1)
Two Way Costless Collars - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	44
Fair value	$ (5)
Two Way Costless Collars - 2024 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	512
Fair value	$ (2)
Two Way Costless Collars - 2024 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.53
Two Way Costless Collars - 2024 Sold Calls | Oil
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / bbl	85.63
Fixed Price Swaps - 2025 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	41
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	77.66
Fair value	$ 0
Fixed Price Swaps - 2025 | Propane
Derivative [Line Items]
Volume (Bcf, MBbls) | MBbls	63
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	26.46
Fair value	$ 0
Three Way Costless Collars - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	77
Fair value	$ (5)
Three Way Costless Collars - 2024 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.99
Financial protection on production - 2025 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	179
Fair value	$ 27
Two Way Costless Collars - 2025 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	73
Fair value	$ 11
Two Way Costless Collars - 2025 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	5.40
Three Way Costless Collars - 2025 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	106
Fair value	$ 16
Three Way Costless Collars - 2025 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	5.69
Basis Swaps | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	126
Fair value	$ 36
Basis Swap - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	71
Basis differential per MMBtu | $ / MMBTU	(0.57)
Fair value	$ 24
Basis Swap - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	46
Basis differential per MMBtu | $ / MMBTU	(0.71)
Fair value	$ 9
Basis Swap - 2025 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	9
Basis differential per MMBtu | $ / MMBTU	(0.64)
Fair value	$ 3
Call options | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	243
Fair value	$ (47)
Call Options - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	15
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.97
Fair value	$ (4)
Call Options - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	82
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	6.56
Fair value	$ (9)
Call Options 2025 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	73
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	7.00
Fair value	$ (14)
Call Options 2026 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Bcf	73
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	7.00
Fair value	$ (20)
Sold Puts | Three Way Costless Collars - 2023 Sold Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.08
Sold Puts | Three Way Costless Collars - 2023 Sold Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	34.36
Sold Puts | Three Way Costless Collars - 2024 Sold Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.46
Sold Puts | Three Way Costless Collars - 2025 Sold Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.50
Purchased Puts | Two Way Costless Collars - 2023 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.88
Purchased Puts | Two Way Costless Collars - 2023 Purchased Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	70.00
Purchased Puts | Three Way Costless Collars - 2023 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.50
Purchased Puts | Three Way Costless Collars - 2023 Purchased Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	46.05
Purchased Puts | Two Way Costless Collars - 2024 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.07
Purchased Puts | Two Way Costless Collars - 2024 Purchased Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	70.00
Purchased Puts | Three Way Costless Collars - 2024 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.19
Purchased Puts | Two Way Costless Collars - 2025 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.50
Purchased Puts | Three Way Costless Collars - 2025 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.75