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Note 15 - Selected Quarterly Financial Data (Unaudited) - Schedule of Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue (less agency commissions) | $ 792 | $ 604 | $ 451 | $ 534 | $ 579 | $ 517 | $ 508 | $ 518 | $ 2,381 | $ 2,122 | $ 1,084
Operating income | 351 | 212 | 65 | 124 | 180 | 139 | 119 | 40 | 752 | 478 | 389
Net income (loss) attributable to common stockholders | $ 211 | $ 109 | $ (2) | $ 40 | $ 81 | $ 46 | $ 31 | $ (31) | $ 358 | $ 127 | $ 211
Basic net income (loss) attributable to common stockholders per share (in dollars per share) | $ 2.24 | $ 1.15 | $ (0.02) | $ 0.41 | $ 0.82 | $ 0.46 | $ 0.31 | $ (0.31) | $ 3.73 | $ 1.28 | $ 2.39
Net income attributable to common stockholders (in dollars per share) | $ 2.22 | $ 1.14 | $ (0.02) | $ 0.40 | $ 0.81 | $ 0.46 | $ 0.31 | $ (0.31) | $ 3.69 | $ 1.27 | $ 2.37

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