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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income |  | $ 635 | $ 848 | $ 1,266 | $ 1,556
Other comprehensive income (loss) items: |  |  |  |  |
Foreign currency translation losses |  | 0 | (1) | 0 | 0
Unrealized gains (losses) on derivatives | [1] | (18) | (1) | (16) | (4)
Pension and postretirement gains (losses) | [2] | 2 | 5 | 4 | 9
Reclassification of realized (gains) losses on derivatives | [3] | 0 | 1 | 0 | 3
Other comprehensive income (loss), net of tax |  | (16) | 4 | (12) | 8
Comprehensive income |  | $ 619 | $ 852 | $ 1,254 | $ 1,564
[1] | Net of tax of $5 and zero for the three months ended June 30, 2019, and 2018, and $5 and $1 for the six months ended June 30, 2019, and 2018, respectively.
[2] | Net of tax of zero and $(2) for the three months ended June 30, 2019, and 2018, and $(1) and $(3) for the six months ended June 30, 2019, and 2018, respectively.
[3] | Net of tax of zero for the three and six months ended June 30, 2019, and zero and $(1) for the three and six months ended June 30, 2018, respectively.

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- Definition Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32157-110900 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a-c) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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