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Retirement Plans (Schedule of Expected Benefit Payments) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	$ 6
2020	12
2021	6
2022	7
2023	7
2024 through 2028	40
Total future benefit payments	78
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	4
2020	5
2021	4
2022	5
2023	5
2024 through 2028	29
Total future benefit payments	52
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	2
2020	7
2021	2
2022	2
2023	2
2024 through 2028	10
Total future benefit payments	25
Post-retirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	0
2020	0
2021	0
2022	0
2023	0
2024 through 2028	1
Total future benefit payments	$ 1

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