Allowance for Expected Credit Losses (Details) - Changes in the Allowance for Expected Credit Losses on Contractholder Receivables (Details) $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2020
USD ($)
| |
| Credit Loss [Abstract] | |
| Contractholder receivables (net of the allowance for expected credit losses), balance, beginning of year | $ 4,599 |
| Contractholder receivables (net of the allowance for expected credit losses), balance, end of period | 4,634 |
| Contractholder receivables, allowance for expected credit losses [Roll Forward] | |
| Contractholder receivables, allowance for expected credit losses, beginning balance | 20 |
| Current period change for expected credit losses | 0 |
| Write-offs of uncollectible contractholder receivables | 0 |
| Contractholder receivables, allowance for expected credit losses, ending balance | $ 20 |