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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Accrued expenses and reserve liabilities $ 57 $ 52
Other accrued medical costs 23 15
Net operating losses 13 11
Unearned premiums 17 18
Lease financing obligation 9 8
Tax credit carryover 5 7
Other 6 4
Valuation allowance (10) (17)
Total deferred income tax assets, net of valuation allowance 120 98
Fixed assets and intangibles (1) (7)
Prepaid expenses (13) (10)
Unrealized gains and losses 0 (12)
Total deferred income tax liabilities (14) (29)
Net deferred income tax asset $ 106 $ 69