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Common Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

Share issued

The following table summarizes the number of Common and Series A Common Shares issued.

			Common Shares						Series A Common Shares						Common Treasury Shares
(Shares in millions)
Balance at December 31, 2017			126						7						22
Dividend reinvestment, incentive and compensation plans			—						—						(3)
Balance at December 31, 2018			126						7						19
Dividend reinvestment, incentive and compensation plans			—						—						(1)
Balance at December 31, 2019			126						7						18
Repurchase of Common Shares			—						—						1
Balance at December 31, 2020			126						7						19

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Tabular disclosure of the change in common stock outstanding.

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