Earnings Per Common Share - Reconciliation of Numerator and Denominator for Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Earnings Per Share [Abstract] | ||||||||
| Net income attributable to common shareholders | $ 264 | $ 176 | $ 124 | $ 240 | $ 170 | $ 113 | $ 564 | $ 523 |
| Weighted-average common shares outstanding - Basic (per share) | 181 | 181 | 181 | 181 | ||||
| Effect of dilutive common stock equivalents (per shares) | 1 | 0 | 0 | 0 | ||||
| Weighted-average common shares outstanding - Diluted (per share) | 182 | 181 | 181 | 181 | ||||