Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended													12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 31, 2023
Class of Stock [Line Items]
Stock repurchase program, authorized amount																	$ 300
Shares repurchased under share repurchase programs (in shares)														5,300
Shares acquired average cost per share														$ 25.32
Quarterly cash dividends on common stock (in usd per share)		$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.200	$ 0.200	$ 0.200	$ 0.200	$ 0.140	$ 0.140	$ 0.140	$ 0.125	$ 0.900	$ 0.800	$ 0.545
Forecast
Class of Stock [Line Items]
Quarterly cash dividends on common stock (in usd per share)	$ 0.245
Total of 3Q19, 1Q20, and 3Q21 Repurchase Programs
Class of Stock [Line Items]
Shares repurchased under share repurchase programs (in shares)														5,264	19,506	17,752
Stock repurchase program, remaining purchase authority		$ 167												$ 167