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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (losses) gains - net | $ 1 | $ (32) | $ (60) | $ (59)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit | 2 | 18 | (15) | 12
Foreign Currency Transaction (Loss) Gain After Tax | 3 | (14) | (75) | (47)
Subsidiary Monetary Position |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (losses) gains - net | (13) | 17 | (239) | 7
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit | 5 | 7 | 28 | (3)
Foreign Currency Transaction (Loss) Gain After Tax | (8) | 24 | (211) | 4
Hedging Program [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Pre-tax exchange (losses) gains - net | 14 | (49) | 179 | (66)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit | (3) | 11 | (43) | 15
Foreign Currency Transaction (Loss) Gain After Tax | $ 11 | $ (38) | $ 136 | $ (51)

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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