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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2022
Income Tax Disclosure [Abstract]  
Differences Between Statutory Income Tax Rate And Effective Income Tax Rate
The differences between the 21% statutory federal income tax rate and our effective income tax rate were as follows:
(Dollars in millions)Three months ended September 30,Nine months ended September 30,
2022202120222021
Tax at statutory rate:$(122)21.0 %$39 21.0 %$(416)21.0 %$383 21.0 %
Increase (decrease) resulting from:        
Tax-exempt income from municipal bonds(5)0.9 (5)(2.7)(15)0.8 (15)(0.8)
Dividend received exclusion(5)0.9 (5)(2.7)(15)0.8 (14)(0.8)
Release of unrecognized tax benefit(34)5.9 — — (34)1.7 — — 
Other5 (0.9)2 1.2 (1)— (6)(0.3)
Provision (benefit) for income taxes$(161)27.8 %$31 16.8 %$(481)24.3 %$348 19.1 %
Reconciliation of the Total Amounts of Unrecognized Tax Benefits The following is a tabular reconciliation of the total amounts of unrecognized tax benefits:
(Dollars in millions)Three months ended September 30,Nine months ended September 30,
2022202120222021
Gross unrecognized tax benefits, beginning of period$34 $34 $34 $34 
Gross increase in prior year positions— — — — 
Gross decrease in prior year positions(34)— (34)— 
Gross increase in current year positions— — — — 
Settlements with tax authorities— — — — 
Lapse of statute of limitations— — — — 
Gross unrecognized tax benefits, end of period$— $34 $— $34