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Taxes on Income - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of beginning and ending amount of unrecognized tax benefits |  |  |
Balance at beginning of year | $ 147 | $ 212 | $ 221
Additions based on tax positions related to the current year | 21 | 19 | 23
Additions for tax positions of prior years | 11 | 2 | 17
Reduction for tax positions of prior years | (15) | (21) | (32)
Reduction for settlements | (33) | (65) | (5)
Expiration of applicable statutes of limitations | (7) | 0 | (12)
Balance at end of year | $ 124 | $ 147 | $ 212

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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