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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Special items | $ (69) | $ (112) | $ (304) | $ 202 |  | $ 2 | $ 12 | $ (283) | $ 14 | $ 435
Earnings Per Share, Diluted, Special Items Impact (in dollars per share) | $ 0.19 | $ 0.31 | $ 0.84 | $ (0.55) |  | $ 0.01 | $ (0.02) |  |  |
Gain on equity method investments |  |  |  |  | $ 15 |  |  | $ 0 | $ 15 | $ 0
Gain on equity method investments (in dollars per share) |  |  |  |  | $ 0.04 |  |  |  |  |

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- Definition Earnings Per Share, Diluted, Gain on Equity Method Investments Impact + References No definition available. + Details
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- Definition Earnings Per Share, Diluted, Special Items Impact + References No definition available. + Details
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- Definition Special items during period + References No definition available. + Details
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- Definition The profit or loss on sales of previously unissued stock by subsidiaries or equity investees made to investors outside the consolidated group that is not reported as operating income. Represents the difference in the parent company's carrying amount of the equity interest in the subsidiary or equity investee immediately before and after the transaction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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