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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss by Component | The following table shows the changes in accumulated other comprehensive loss by component. Amounts in parentheses indicate debits.
(In millions) | Pension Benefits |  | Other Benefits |  | Gain on Cash Flow Hedge |  | Workers Compensation |  | Total
Balance as of December 31, 2016 | $ | (233 | ) |  | $ | (7 | ) |  | $ | 4 |  |  | $ | 2 |  |  | $ | (234 | )
Other comprehensive loss before reclassifications | (1 | ) |  | — |  |  | — |  |  | — |  |  | (1 | )
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |
Amortization – prior service credit(a) | (10 | ) |  | (1 | ) |  | — |  |  | — |  |  | (11 | )
– actuarial loss(a) | 9 |  |  | — |  |  | — |  |  | — |  |  | 9 |
– settlement loss(a) | — |  |  | — |  |  | — |  |  | — |  |  | — |
Tax effect | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other comprehensive loss | (2 | ) |  | (1 | ) |  | — |  |  | — |  |  | (3 | )
Balance as of March 31, 2017 | $ | (235 | ) |  | $ | (8 | ) |  | $ | 4 |  |  | $ | 2 |  |  | $ | (237 | )
(In millions) | Pension Benefits |  | Other Benefits |  | Gain on Cash Flow Hedge |  | Workers Compensation |  | Total
Balance as of December 31, 2017 | $ | (190 | ) |  | $ | (48 | ) |  | $ | 4 |  |  | $ | 3 |  |  | $ | (231 | )
Other comprehensive loss before reclassifications | — |  |  | — |  |  | (2 | ) |  | — |  |  | (2 | )
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |
Amortization – prior service credit(a) | (8 | ) |  | (1 | ) |  | — |  |  | — |  |  | (9 | )
– actuarial loss(a) | 9 |  |  | — |  |  | — |  |  | — |  |  | 9 |
– settlement loss(a) | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Tax effect | (1 | ) |  | — |  |  | — |  |  | — |  |  | (1 | )
Other comprehensive income (loss) | 1 |  |  | (1 | ) |  | (2 | ) |  | — |  |  | (2 | )
Balance as of March 31, 2018 | $ | (189 | ) |  | $ | (49 | ) |  | $ | 2 |  |  | $ | 3 |  |  | $ | (233 | )
(a) | These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 20.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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