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Pension and Other Postretirement Benefits (Schedule of Pension Assets/(Liabilities)) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Benefits [Abstract] |  |
Non-current assets | $ 532 | $ 491
Current liabilities | 8 | 13
Non-current liabilities | $ 610 | $ 533

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