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Stock-Based Compensation - Schedule of pre-tax compensation expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 12 | $ 12 | $ 39 | $ 42
Restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 6 | 4 | 25 | 23
Performance restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 3 | 4 | 4 | 6
Stock options |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 1 | 6 | 5
Long-term stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 2 | 3 | 4 | 6
Phantom stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 0 | $ 0 | $ 0 | $ 2

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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