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Stock Based Awards and Other Equity Instruments - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jun. 08, 2021	Jun. 28, 2013	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 21, 2018	Dec. 20, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capitalized stock based compensation as website development costs			$ 13	$ 10	$ 10
Common shares registered for issuance under incentive plan							17,500,000
Common stock share issuance under plan		15,000,000
Unrecognized compensation expense			$ 245
Weighted average period remaining (in years)			2 years 6 months
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing stock price			$ 14.77
Total intrinsic value			$ 0	0	0
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of RSUs vested			$ 118	109	108
2011 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares registered for issuance under incentive plan							17,400,000
Deferred Compensation Plan for Non Employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares registered for issuance under incentive plan							100,000
2018 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock share issuance under plan	10,000,000		12,000,000
Common stock share issuance under plan						6,000,000
Number of shares reserved for future stock-based awards under plan			16,000,000
2018 Plan \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of stock options vested			$ 7	7	16
Cash received from stock option exercises			$ 0	$ 0	$ 0