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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 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 March 31, 2020 |  | $ | (613 | ) |  | $ | (14 | ) |  | $ | (144 | ) |  | $ | (771 | )
| Changes in value |  | (721 | ) |  | 17 |  |  | 156 |  |  | (548 | )
| Amounts reclassified to earnings |  | 77 |  | (a) | — |  |  | (17 | ) |  | 60 |
| 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 | )
| Balance at March 31, 2019 |  | $ | (654 | ) |  | $ | 1 |  |  | $ | (140 | ) |  | $ | (793 | )
| Changes in value |  | (29 | ) |  | 2 |  |  | 7 |  |  | (20 | )
| Amounts reclassified to earnings |  | 8 |  | (a) | — |  |  | (2 | ) |  | 6 |
| Balance at June 30, 2019 |  | $ | (675 | ) |  | $ | 3 |  |  | $ | (135 | ) |  | $ | (807 | )
| Balance at December 31, 2018 |  | $ | (663 | ) |  | $ | (4 | ) |  | $ | (136 | ) |  | $ | (803 | )
| Changes in value |  | (24 | ) |  | 7 |  |  | 4 |  |  | (13 | )
| Amounts reclassified to earnings |  | 12 |  | (a) | — |  |  | (3 | ) |  | 9 |
| Balance at June 30, 2019 |  | $ | (675 | ) |  | $ | 3 |  |  | $ | (135 | ) |  | $ | (807 | )
(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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