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Pension and Other Postretirement Benefits (Schedule of Pension Assets/(Liabilities)) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Non-current assets | $ 491 | $ 360
Current liabilities | 13 | 14
Non-current liabilities | 533 | 549
Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income | 4,604 | 4,270
Pension Plan | U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income | $ 1,130 | $ 1,011

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