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Marketable Securities	9 Months Ended
Marketable Securities	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Marketable Securities, at Fair Value	Marketable Securities The Company's nonqualified trusts hold available-for-sale securities for funding requirements of the Company's nonqualified pension plans. Available-for-sale securities as of September 30, 2019 and December 31, 2018 were $26 million and $31 million, respectively, and were recorded at amortized cost, which approximates fair value.