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Taxes on Income - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Measurement period adjustment, income tax expense (benefit) |  | $ 149 |  |  |
Transition tax for accumulated foreign earnings, income tax expense (benefit) |  | 173 |  |  |
Change in tax rate, income tax expense (benefit) |  | (24) |  |  |
Undistributed earnings of foreign subsidiaries for income tax purposes |  | 780 |  |  |
Net income tax payments |  | 709 | $ 683 | $ 260 |
Operating loss carryforwards |  | 564 |  |  |
Total amount of federal, state and local, and foreign unrecognized tax benefits excluding interest and penalties |  | 212 | 221 | 162 | $ 155
Decrease in unrecognized tax benefits |  | 4 |  |  |
Accrued interest and penalties associated with uncertain tax positions |  | 59 | 44 |  |
Decrease in amount of unrecognized tax benefits from settlements |  | $ 5 | $ 6 | $ 18 |
Forecast | Maximum |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Decrease in amount of unrecognized tax benefits from settlements | $ 60 |  |  |  |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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