CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Available for Sale at Fair value - Amortized cost	$ 49,548	$ 46,753
Preferred stock par value	$ 0.01
Preferred stock shares authorized	10,000,000
Common stock par value	$ 0.01
Common stock shares authorized	140,000,000
Common Stock, Shares, Issued	85,310,598	79,137,758
Treasury Shares Held	17,353,697	16,481,656
Allowances for Loan and Lease Losses, Real Estate	$ 64	$ 12
Financing Receivable, Allowance for Credit Loss	$ 20