Derivatives and Risk Management (Schedule of Derivative Instruments Notional Amount, Weighted Average Contract Prices and Fair Value) (Details) - Not Designated as Hedging Instrument bbl in Thousands, Mcf in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) $ / MMBTU $ / bbl Mcf bbl
Financial protection on production - 2022 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	982
Fair value	$ (2,672)
Financial protection on production - 2022 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	3,413
Fair value	$ (132)
Financial protection on production - 2022 | Propane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	4,873
Fair value	$ (124)
Fixed Price Swaps - 2022 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	627
Weighted average price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.04
Fair value	$ (1,672)
Fixed Price Swaps - 2022 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	2,376
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	53.32
Fair value	$ (94)
Fixed Price Swaps - 2022 | Ethane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	4,142
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	11.27
Fair value	$ (26)
Fixed Price Swaps - 2022 | Propane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	4,643
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	31.09
Fair value	$ (118)
Fixed Price Swaps - 2022 | Normal Butane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	1,388
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	36.22
Fair value	$ (43)
Fixed Price Swaps - 2022 | Natural Gasoline
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	1,497
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	55.78
Fair value	$ (57)
Two Way Costless Collars - 2022 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	78
Fair value	$ (216)
Two Way Costless Collars - 2022 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.92
Three-Way Costless Collars - 2022 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	277
Fair value	$ (784)
Three-Way Costless Collars - 2022 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	1,037
Fair value	$ (38)
Three-Way Costless Collars - 2022 | Propane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	230
Fair value	$ (6)
Three-way Costless Collars - 2022 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.88
Three-way Costless Collars - 2022 Sold Calls | Oil
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / bbl	57.01
Three-way Costless Collars - 2022 Sold Calls | Propane
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / bbl	31.92
Financial protection on production- 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	938
Fair value	$ (1,247)
Financial protection on production- 2023 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	2,114
Fair value	$ (59)
Fixed Price Swaps - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	504
Weighted average price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.08
Fair value	$ (675)
Fixed Price Swaps - 2023 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	846
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	55.98
Fair value	$ (23)
Fixed Price Swaps - 2023 | Ethane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	1,308
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	11.91
Fair value	$ (3)
Fixed Price Swaps - 2023 | Propane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	1,066
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	37.15
Fair value	$ (8)
Fixed Price Swaps - 2023 | Normal Butane
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	329
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	40.64
Fair value	$ (3)
Fixed Price Swaps - 2023 | Natural Gasoline
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	359
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	66.00
Fair value	$ (5)
Two Way Costless Collars - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	219
Fair value	$ (217)
Two Way Costless Collars - 2023 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.55
Three Way Costless Collars - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	215
Fair value	$ (355)
Three Way Costless Collars - 2023 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	1,268
Fair value	$ (36)
Three Way Costless Collars - 2023 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.00
Three Way Costless Collars - 2023 Sold Calls | Oil
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / bbl	56.12
Financial protection on production - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	279
Fair value	$ (205)
Fixed Price Swaps - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	224
Weighted average price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.96
Fair value	$ (174)
Fixed Price Swaps - 2024 | Oil
Derivative [Line Items]
Volume (Bcf, MBbls) | bbl	603
Weighted average price (in dollars per MMBtu, Bbl) | $ / bbl	68.68
Fair value	$ (5)
Two Way Costless Collars - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	44
Fair value	$ (19)
Two Way Costless Collars - 2024 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.53
Three Way Costless Collars - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	11
Fair value	$ (12)
Three Way Costless Collars - 2024 Sold Calls | Natural Gas
Derivative [Line Items]
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.54
Basis Swaps | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	582
Fair value	$ 104
Basis Swaps - 2022 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	277
Basis differential per MMBtu | $ / MMBTU	(0.53)
Fair value	$ 72
Basis Swap - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	250
Basis differential per MMBtu | $ / MMBTU	(0.47)
Fair value	$ 20
Basis Swap - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	46
Basis differential per MMBtu | $ / MMBTU	(0.71)
Fair value	$ 9
Basis Swap - 2025 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	9
Basis differential per MMBtu | $ / MMBTU	(0.64)
Fair value	$ 3
Call options | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	118
Fair value	$ (258)
Call Options - 2022 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	63
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.01
Fair value	$ (171)
Call Options - 2023 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	46
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.94
Fair value	$ (74)
Call Options - 2024 | Natural Gas
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	9
Cap price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.00
Fair value	$ (13)
Purchased Fixed Price Swaps, Storage - 2022
Derivative [Line Items]
Volume (Bcf, MBbls) | Mcf	0
Weighted average price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.14
Basis differential per MMBtu | $ / MMBTU	0
Fair value	$ 1
Sold Puts | Three-Way Costless Collars - 2022 Sold Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.03
Sold Puts | Three-Way Costless Collars - 2022 Sold Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	39.83
Sold Puts | Three-Way Costless Collars - 2022 Sold Puts | Propane
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	16.80
Sold Puts | Three Way Costless Collars - 2023 Sold Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.09
Sold Puts | Three Way Costless Collars - 2023 Sold Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	33.97
Sold Puts | Three Way Costless Collars - 2024 Sold Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.25
Purchased Puts | Two Way Costless Collars - 2022 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.53
Purchased Puts | Three Way Costless Collars - 2022 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.48
Purchased Puts | Three Way Costless Collars - 2022 Purchased Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	50.17
Purchased Puts | Three Way Costless Collars - 2022 Purchased Puts | Propane
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	21.00
Purchased Puts | Two Way Costless Collars - 2023 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	3.03
Purchased Puts | Three Way Costless Collars - 2023 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.54
Purchased Puts | Three Way Costless Collars - 2023 Purchased Puts | Oil
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / bbl	45.51
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 | Three Way Costless Collars - 2024 Purchased Puts | Natural Gas
Derivative [Line Items]
Floor price (in dollars per MMBtu, Bbl) | $ / MMBTU	2.80