Stock-Based Compensation (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for awards to employees and outside directors (in shares)	15
RSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant date fair value of shares vested	$ 52	$ 49	$ 45
Unrecognized compensation cost	$ 33
Unrecognized compensation cost, period of recognition (in months)	23 months
RSU awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Performance awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Total grant date fair value of shares vested	$ 31	$ 25
Unrecognized compensation cost	$ 23
Unrecognized compensation cost, period of recognition (in months)	22 months
Risk free interest rate (as a percent)	4.43%
Expected volatility rate (as a percent)	28.60%
Performance awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent (as a percent)	0.00%
Performance awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent (as a percent)	200.00%