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Income Taxes (Reconciliation of Income Tax Provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes      
U.S. statutory rate applied to income before income taxes 21.00% 21.00% 21.00%
State income taxes, net of federal tax benefit 1.20% 2.30% 2.50%
Routine tax incentives (5.80%) (4.30%) (3.50%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 1.50% 0.80% 0.40%
Statutory rates other than U.S. statutory rate 2.40% 2.70% 1.50%
Valuation allowance 2.40% 0.70% 1.00%
Nonrecurring capital loss 0.00% 0.00% (1.80%)
Other - net [1] (1.20%) (0.10%) 0.60%
Effective income tax rate 21.50% 23.10% 21.70%
Deferred tax assets, prepaid royalties $ 117 $ 1  
[1] Other - net is composed of numerous items, none of which is greater than 1.05 percent of income before income taxes.