Employee Benefit Plans (Narrative) (Details) - Unfunded Supplemental Employee Retirement Plan (SERP) [Member] - USD ($) |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
|
Defined Benefit Plan Disclosure [Line Items] | |||||
Net periodic benefit cost | $ 2,000,000 | $ 2,000,000 | $ 3,000,000 | $ 4,000,000 | |
Accrued benefits liabilities | 69,000,000 | $ 69,000,000 | $ 66,000,000 | ||
Defined benefit plans and other post-retirement plans, weighted-average assumptions to determine net periodic cost, discount rate | 4.20% | 3.40% | |||
Defined benefit plans and other post-retirement plans, weighted-average assumptions to determine net periodic cost, rate of compensation increase | 3.00% | 2.00% | |||
Assets in a rabbi trust generally designated to pay benefits of the SERP | $ 80,000,000 | $ 80,000,000 | $ 74,000,000 | ||
Defined benefit plan, noncash settlement loss | $ 0 | $ 1,000,000 |