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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income, Net of Tax | The tables below present the components of the Company's accumulated other comprehensive income (loss), net of tax ("AOCI") (in millions):
|  | Pension and Other Postretirement Liabilities |  | Investments and Other |  | Deferred Taxes |  | Total
Balance at June 30, 2020 |  | $ | (1,257) |  |  | $ | 3 |  |  | $ | (5) |  |  | $ | (1,259) |
Changes in value |  | (11) |  |  | — |  |  | 2 |  |  | (9) |
Amounts reclassified to earnings |  | 333 |  | (a) | — |  |  | (74) |  |  | 259 |
Balance at September 30, 2020 |  | $ | (935) |  |  | $ | 3 |  |  | $ | (77) |  |  | $ | (1,009) |
Balance at December 31, 2019 |  | $ | (560) |  |  | $ | 2 |  |  | $ | (160) |  |  | $ | (718) |
Changes in value |  | (781) |  |  | 1 |  |  | 173 |  |  | (607) |
Amounts reclassified to earnings |  | 406 |  | (a) | — |  |  | (90) |  |  | 316 |
Balance at September 30, 2020 |  | $ | (935) |  |  | $ | 3 |  |  | $ | (77) |  |  | $ | (1,009) |
Balance at June 30, 2019 |  | $ | (675) |  |  | $ | 3 |  |  | $ | (135) |  |  | $ | (807) |
Changes in value |  | 394 |  |  | — |  |  | (87) |  |  | 307 |
Amounts reclassified to earnings |  | (4) |  | (a) | (1) |  |  | 1 |  |  | (4) |
Balance at September 30, 2019 |  | $ | (285) |  |  | $ | 2 |  |  | $ | (221) |  |  | $ | (504) |
Balance at December 31, 2018 |  | $ | (663) |  |  | $ | (4) |  |  | $ | (136) |  |  | $ | (803) |
Changes in value |  | 370 |  |  | 7 |  |  | (83) |  |  | 294 |
Amounts reclassified to earnings |  | 8 |  | (a) | (1) |  |  | (2) |  |  | 5 |
Balance at September 30, 2019 |  | $ | (285) |  |  | $ | 2 |  |  | $ | (221) |  |  | $ | (504) |
(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (See Note 6 to the financial statements included in Part I, Item 1 for additional information).

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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