Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Amortized Cost	$ 27,370	$ 30,245
Allowance for credit loss	7	0
Held-to-maturities, fair value	$ 97,227	$ 17,217
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	383,500	350,000
Preferred stock, shares outstanding	383,500	350,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares, issued	58,748,469	51,888,463
Common stock, shares outstanding	58,748,469	51,888,463