Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 1,922	$ 1,391
Derivative Liabilities	(2,169)	(1,508)
Current derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	1,517	1,035
Noncurrent derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	405	356
Current derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(1,535)	(1,037)
Noncurrent derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(634)	(471)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	(2)	(4)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	744	454
Derivative Liabilities	(1,018)	(594)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	963	643
Derivative Liabilities	(935)	(622)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	213	294
Derivative Liabilities	(214)	(288)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	(2)	(4)
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	0	0
Derivatives designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(2)	(4)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	1,921	1,391
Derivative Liabilities	(2,167)	(1,504)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments | Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	744	454
Derivative Liabilities	(1,018)	(594)
Derivatives not designated as hedging instruments | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	963	643
Derivative Liabilities	(935)	(622)
Derivatives not designated as hedging instruments | Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	213	294
Derivative Liabilities	$ (214)	$ (288)