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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
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 March 31, 2021 |  | $ | (1,084) |  |  | $ | 1 |  |  | $ | (43) |  |  | $ | (1,126) |
Changes in value |  | 11 |  |  | — |  |  | (2) |  |  | 9 |
Amounts reclassified to earnings |  | 5 |  | (a) | — |  |  | (2) |  |  | 3 |
Balance at June 30, 2021 |  | $ | (1,068) |  |  | $ | 1 |  |  | $ | (47) |  |  | $ | (1,114) |
Balance at December 31, 2020 |  | $ | (1,102) |  |  | $ | 2 |  |  | $ | (39) |  |  | $ | (1,139) |
Changes in value |  | 24 |  |  | (1) |  |  | (5) |  |  | 18 |
Amounts reclassified to earnings |  | 10 |  | (a) | — |  |  | (3) |  |  | 7 |
Balance at June 30, 2021 |  | $ | (1,068) |  |  | $ | 1 |  |  | $ | (47) |  |  | $ | (1,114) |
Balance at March 31, 2020 |  | $ | (613) |  |  | $ | (14) |  |  | $ | (144) |  |  | $ | (771) |
Changes in value |  | (721) |  |  | 17 |  |  | 156 |  |  | (548) |
Amounts reclassified to earnings |  | 77 |  | (a) | — |  |  | (17) |  |  | 60 |
Amounts reclassified to retained earnings |  | — |  |  | — |  |  | — |  |  | — |
Balance at June 30, 2020 |  | $ | (1,257) |  |  | $ | 3 |  |  | $ | (5) |  |  | $ | (1,259) |
Balance at December 31, 2019 |  | $ | (560) |  |  | $ | 2 |  |  | $ | (160) |  |  | $ | (718) |
Changes in value |  | (770) |  |  | 1 |  |  | 171 |  |  | (598) |
Amounts reclassified to earnings |  | 73 |  | (a) | — |  |  | (16) |  |  | 57 |
Balance at June 30, 2020 |  | $ | (1,257) |  |  | $ | 3 |  |  | $ | (5) |  |  | $ | (1,259) |
(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 5 of this report 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=124509347&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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