Benefit Plans (Impact of One Point Change in Assumptions) (Details) $ in Millions |
12 Months Ended |
---|---|
Dec. 31, 2020
USD ($)
| |
Defined Benefit Plan Assumptions Sensitivity To Changes [Abstract] | |
Increase of 1% in the discount rate | $ (9) |
Decrease of 1% in the discount rate | 6 |
Increase of 1% in the long-term rate of return on plan assets | (12) |
Decrease of 1% in the long-term rate of return on plan assets | $ 12 |