XML 74 R49.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Common Shareholders' Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
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, 2016 | 126 |  |  | 7 |  |  | 23 |
Dividend reinvestment, incentive and compensation plans | — |  |  | — |  |  | (1 | )
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 |

X
- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCommonStockOutstandingRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration