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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |
Pre-tax exchange (losses) gains - net | [1] | $ (35) | $ (61)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit |  | (5) | (17)
Foreign Currency Transaction (Loss) Gain After Tax |  | (40) | (78)
Subsidiary Monetary Position |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |
Pre-tax exchange (losses) gains - net |  | (51) | (226)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit |  | (1) | 23
Foreign Currency Transaction (Loss) Gain After Tax |  | (52) | (203)
Hedging Program [Member] |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |
Pre-tax exchange (losses) gains - net |  | 16 | 165
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit |  | (4) | (40)
Foreign Currency Transaction (Loss) Gain After Tax |  | $ 12 | $ 125
[1] | Includes net pre-tax exchange losses of $(23) million and $(9) million associated with the devaluation of the Argentine peso for the three months ended March 31, 2021 and 2020, respectively.

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121605123&loc=d3e30226-110892 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=120253306&loc=d3e28228-110885 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 + Details
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