Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Amortized cost of fixed maturity securities available-for-sale	$ 66,992	$ 63,083
Fixed maturity securities, allowance for credit losses	3	0
Mortgage loans valuation allowances	90	64
Leveraged leases, allowance for credit losses	$ 13	$ 0
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value	$ 25,000	$ 25,000
Common stock, shares authorized	4,000	4,000
Common stock, shares issued	3,000	3,000
Common stock, shares outstanding	3,000	3,000