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Retirement Plans and Profit Sharing Arrangements (Amounts recognized in Balance Sheet) (Details 3) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Pension Plans [Member] |  |
Amounts recognized in the Consolidated Balance Sheets |  |
Benefit liability | $ (366) | $ (278)
Benefit asset | 0 | 5
Net amount recognized | (366) | (273)
Other Postretirement Benefits Plan [Member] |  |
Amounts recognized in the Consolidated Balance Sheets |  |
Benefit liability | (14) | (14)
Benefit asset | 0 | 0
Net amount recognized | $ (14) | $ (14)

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