Allowance for Expected Credit Losses (Details) - Changes in the Allowance for Expected Credit Losses on Contractholder Receivables (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Credit Loss [Abstract] | ||||
| Contractholder receivables (net of the allowance for expected credit losses), balance, beginning of period | $ 3,095 | $ 3,274 | $ 3,171 | $ 3,249 |
| Contractholder receivables (net of the allowance for expected credit losses), balance, end of period | 3,098 | 3,292 | 3,098 | 3,292 |
| Contractholder receivables, allowance for expected credit losses [Roll Forward] | ||||
| Contractholder receivables, allowance for expected credit losses, beginning balance | 17 | 18 | 18 | 20 |
| Current period change for expected credit losses | 0 | 0 | (1) | (2) |
| Write-offs of uncollectible contractholder receivables | 0 | 0 | 0 | 0 |
| Contractholder receivables, allowance for expected credit losses, ending balance | $ 17 | $ 18 | $ 17 | $ 18 |