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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (loss) gain | [1],[2] | $ (174) | $ (99) | $ (127)
Tax benefits (expenses) on exchange (loss) gain |  | 13 | 15 | (52)
Net after-tax exchange (loss) gain |  | (161) | (84) | (179)
Subsidiary Monetary Position |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (loss) gain |  | (263) | (41) | (221)
Tax benefits (expenses) on exchange (loss) gain |  | 34 | 2 | (31)
Net after-tax exchange (loss) gain |  | (229) | (39) | (252)
Hedging Program [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (loss) gain |  | 89 | (58) | 94
Tax benefits (expenses) on exchange (loss) gain |  | (21) | 13 | (21)
Net after-tax exchange (loss) gain |  | 68 | (45) | 73
Tax Reform Foreign Currency Exchange Impact [Member] | Hedging Program [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (loss) gain |  |  |  | (50)
Argentine peso devaluation [Member] | Hedging Program [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (loss) gain |  | $ (82) | $ (51) | $ (68)
[1] | Includes a $(50) million foreign exchange loss for the year ended December 31, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, which is included within significant items.
[2] | Includes net pre-tax exchange losses of $(82) million, $(51) million and $(68) million associated with the devaluation of the Argentine peso for the years ended December 31, 2020, 2019 and 2018, 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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