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Reserve for Known and Incurred but Not Reported Claims (Activity in Reserve for Known and Incurred but Not Reported Claims) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance at beginning of period     $ 1,284 $ 1,178
Provision related to current year     240 267
Provision related to prior years     9 23
Total Provision $ 127 $ 150 249 290
Payments, net of recoveries, related to: Current year     94 107
Payments, net of recoveries, related to: Prior years     129 124
Total Payments, net of recoveries     223 231
Other     (2) 6
Balance at end of period $ 1,308 $ 1,243 $ 1,308 $ 1,243