XML 107 R86.htm IDEA: XBRL DOCUMENT v3.22.0.1
Reserve for Known and Incurred but Not Reported Claims (Activity in Reserve for Known and Incurred but Not Reported Claims) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance at beginning of year $ 1,178 $ 1,063 $ 1,042
Provision related to current year 570 532 436
Provision related to prior years 19 48 10
Total Provision 589 580 446
Payments, net of recoveries, related to: Current year 292 268 227
Payments, net of recoveries, related to: Prior years 190 203 188
Total Payments, net of recoveries 482 471 415
Other (1) 6 (10)
Balance at end of year $ 1,284 $ 1,178 $ 1,063