Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment
Total property, plant, and equipment	$ 2,996	$ 4,483
Accumulated depreciation	(1,308)	(1,936)
Net property, plant, and equipment	1,688	2,547
Depreciation	384	295	$ 271
Facilities and equipment
Property, Plant and Equipment
Total property, plant, and equipment	$ 1,742	3,365
Facilities and equipment | Minimum
Property, Plant and Equipment
Depreciable lives (in years)	1 year
Facilities and equipment | Maximum
Property, Plant and Equipment
Depreciable lives (in years)	40 years
Land and improvements
Property, Plant and Equipment
Total property, plant, and equipment	$ 271	329
Nuclear fuel
Property, Plant and Equipment
Total property, plant, and equipment	$ 222	239
Depreciable lives (in years)	5 years
Hardware and office equipment and furnishings
Property, Plant and Equipment
Total property, plant, and equipment	$ 637	453
Hardware and office equipment and furnishings | Minimum
Property, Plant and Equipment
Depreciable lives (in years)	2 years
Hardware and office equipment and furnishings | Maximum
Property, Plant and Equipment
Depreciable lives (in years)	10 years
Construction in progress
Property, Plant and Equipment
Total property, plant, and equipment	$ 124	$ 97