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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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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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