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Taxes on Income - Carryforwards and valuation allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Taxes on Income |  |  |
Increase (decrease) in valuation allowances | $ 20 | $ 59 | $ (18)
Amount of valuation allowance change that impacted the effective tax rate | 24 | $ 31 |
Unusable Losses [Member] |  |  |
Taxes on Income |  |  |
Increase (decrease) in valuation allowances |  |  | 15
Federal and foreign |  |  |
Taxes on Income |  |  |
Net operating loss carryforwards | 246 |  |
Federal | Tax Credit Carryforwards [Member] |  |  |
Taxes on Income |  |  |
Net operating loss carryforwards | 107 |  |
Foreign.. | Tax Credit Carryforwards [Member] |  |  |
Taxes on Income |  |  |
Increase (decrease) in valuation allowances |  |  | (46)
Foreign.. | Tax Law Changes [Member] |  |  |
Taxes on Income |  |  |
Increase (decrease) in valuation allowances |  |  | (6)
State |  |  |
Taxes on Income |  |  |
Net operating loss carryforwards | $ 55 |  |
Rexam | Business Acquisition Differences [Member] |  |  |
Taxes on Income |  |  |
Increase (decrease) in valuation allowances |  |  | $ 19

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