Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Contingent Residual Support Agreement, Amount	$ 1,000
Estimated litigation liability	73	$ 41
Accrued Environmental Loss Contingencies, Noncurrent	$ 1