Stock-Based Employee Compensation (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) plan $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans | plan	1
Maximum number of award to be granted per individual (in shares) | shares	500,000
Total compensation expense	$ 126,000,000	$ 36,000,000	$ 64,000,000
Maximum aggregate number of shares available under the employee stock purchase plan (in shares) | shares	2,800,000
Purchase price for each share of common stock as percentage of the average of the market price	85.00%
Shares of common stock issued under the ESPP plan (in shares) | shares	151,989	171,279	136,480
Weighted-average price of shares of common stock issued under the ESPP plan (in dollars per share) | $ / shares	$ 71.23	$ 44.01	$ 70.95
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum value of awards that can be granted to participant in any fiscal year	$ 750,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 0	$ 0	$ 0
Stock Option | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares (as a percent)	200.00%
Shares issued (in shares) | shares	314,197
Stock-based awards conversion ratio	1
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) | $ / shares	$ 73.96	$ 79.80	$ 84.83
Fair value of shares released on vesting of restricted stock units	$ 7,000,000	$ 5,000,000	$ 6,000,000
Total unrecognized compensation cost	$ 34,000,000
Weighted-average period of unrecognized compensation cost to be recognized (in years)	1 year 3 months 21 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares (as a percent)	300.00%
Shares issued (in shares) | shares	354,822
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) | $ / shares	$ 74.59	$ 79.80	$ 84.83
Total unrecognized compensation cost	$ 3,000,000
Weighted-average period of unrecognized compensation cost to be recognized (in years)	1 year 2 months 1 day
Restricted Stock | Senior Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares (as a percent)	200.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards conversion ratio	1
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) | $ / shares	$ 75.26	$ 72.21	$ 85.08
Fair value of shares released on vesting of restricted stock units	$ 33,000,000	$ 30,000,000	$ 36,000,000
Total unrecognized compensation cost	$ 38,000,000
Weighted-average period of unrecognized compensation cost to be recognized (in years)	10 months 28 days
2008 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for issuance under stock-based compensation plans (in shares) | shares	10,083,570