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Employee Benefits - Funded Status of Pension Plans Recognized in Balance Sheets (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |
Funded status | $ (131) | $ (155)
Net prepaid pension cost recognized consists of: |  |
Noncurrent assets | 48 | 17
Current liabilities | (14) | (15)
Noncurrent liabilities | (165) | (157)
Net prepaid pension cost recognized | $ (131) | $ (155)

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