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Accumulated Other Comprehensive Loss | 3 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss 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, 2015 | $ | (255 | ) |  | $ | (70 | ) |  | $ | 4 |  |  | $ | 3 |  |  | $ | (318 | )
Other comprehensive income (loss) before reclassifications | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |
Amortization – prior service credit(a) | (11 | ) |  | (1 | ) |  | — |  |  | — |  |  | (12 | )
– actuarial loss(a) | 10 |  |  | 1 |  |  | — |  |  | — |  |  | 11 |
– settlement loss(a) | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Tax effect | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other comprehensive income (loss) | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance as of March 31, 2016 | $ | (255 | ) |  | $ | (70 | ) |  | $ | 4 |  |  | $ | 3 |  |  | $ | (318 | )
(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 income (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 income (loss) | (2 | ) |  | (1 | ) |  | — |  |  | — |  |  | (3 | )
Balance as of March 31, 2017 | $ | (235 | ) |  | $ | (8 | ) |  | $ | 4 |  |  | $ | 2 |  |  | $ | (237 | )
(a) | These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 19.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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