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Share-Based Compensation Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of shares originally available for grant	7,700
Shares available for grant	3,700
Closing stock price per share	$ 55.81
Total intrinsic value of stock options exercised	$ 4	$ 17	$ 29
Restricted Stock
Total fair value of restricted stock awards that fully vested		4	8
Restricted Stock \| Minimum
Share-based compensation vesting period	1 year
Restricted Stock \| Maximum
Share-based compensation vesting period	5 years
Restricted Stock Units (RSUs)
Total fair value of restricted stock awards that fully vested	$ 52	$ 19	$ 21
Restricted Stock Units (RSUs) \| Minimum
Share-based compensation vesting period	3 years
Restricted Stock Units (RSUs) \| Maximum
Share-based compensation vesting period	5 years
Stock Options \| Minimum
Share-based compensation vesting period	1 year
Stock Options \| Maximum
Share-based compensation vesting period	4 years