CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Available for Sale at Fair value - Amortized cost	$ 55,873	$ 49,548
Preferred stock par value	$ 0.01
Preferred stock shares authorized	10,000,000
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	140,000,000
Common Stock, Shares, Issued	85,310,598	85,310,598
Treasury Shares Held	18,139,868	17,353,697
Allowances for Loan and Lease Losses, Real Estate	$ 35	$ 64
Financing Receivable, Allowance for Credit Loss	$ 31	$ 20