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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income |  | $ 1,869 | $ 190 | $ 3,425 | $ 814
Other comprehensive income (loss) items: |  |  |  |  |
Foreign currency translation gains |  | 0 | 2 | 0 | 3
Unrealized gains (losses) on derivatives | [1] | (1) | 8 | (5) | 14
Pension and postretirement gains (losses) | [2] | 144 | 4 | 153 | 12
Reclassification of realized (gains) losses on derivatives | [3] | 10 | 0 | 13 | (1)
Other comprehensive income, net of tax |  | 153 | 14 | 161 | 28
Comprehensive income |  | $ 2,022 | $ 204 | $ 3,586 | $ 842
[1] | Net of tax of zero and $(5) for the three months ended September 30, 2018, and 2017, respectively, and $1 and $(8) for the nine months ended September 30, 2018, and 2017, respectively.
[2] | Net of tax of $(40) and $(3) for the three months ended September 30, 2018, and 2017, respectively, and $(43) and $(7) for the nine months ended September 30, 2018, and 2017, respectively. The three and nine months ended September 30, 2018 include $139 ($178 pre-tax) of other comprehensive income related to a postretirement benefit plan design change. Please refer to Note 9.
[3] | Net of tax of $(3) and zero for the three months ended September 30, 2018, and 2017, respectively, and $(4) and $1 for the nine months ended September 30, 2018, and 2017, respectively.

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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: 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=114867106&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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