Segment Information (Schedule of Other Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 21	$ 28
Accounts receivable	1,071	1,160
Property, plant and equipment	10,215	9,938
Unamortized debt expense	55	57
Right-of-use lease assets	186	187
TOTAL ASSETS	11,847	$ 11,848	$ 5,247
Other
Segment Reporting Information [Line Items]
Cash and cash equivalents	21		4
Accounts receivable	1		0
Prepayments	6		6
Property, plant and equipment	10		15
Unamortized debt expense	9		11
Right-of-use lease assets	63		70
Non-qualified retirement plan	2		4
TOTAL ASSETS	$ 112		$ 110