Consolidated Balance Sheet (unaudited) (Parenthetical) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Restricted cash	$ 2,000,000,000	$ 2,000,000,000
Debt securities, held-to-maturity, fair value	45,983,000,000	34,805,000,000
Debt securities, available-for-sale, allowance for credit loss	12,000,000
Debt securities, available-for-sale, amortized cost	106,668,000,000	87,435,000,000
Long-term debt, fair value	$ 399,000,000	$ 387,000,000
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	100,000,000	100,000,000
Preferred stock, issued (shares)	45,826	35,826
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, authorized (shares)	3,500,000,000	3,500,000,000
Common stock, issued (shares)	1,381,361,699	1,374,443,376
Treasury stock, common shares (shares)	495,499,985	473,760,338
Operating segments
Cash and due from banks, allowance for credit loss	$ 4,000,000
Interest-bearing deposits with banks, allowance for credit losses	1,000,000
Restricted cash	2,210,000,000	$ 2,437,000,000
Federal funds sold and securities purchased under resale agreements, allowance for credit losses	0
Debt securities, held-to-maturity, allowance for credit loss (less than)	0
Debt securities, held-to-maturity, fair value	45,983,000,000	34,805,000,000
Debt securities, available-for-sale, allowance for credit loss	12,000,000
Debt securities, available-for-sale, amortized cost	106,668,000,000	87,435,000,000
Other assets, allowance for credit loss on accounts receivable	4,000,000
Other assets, fair value	529,000,000	419,000,000
Allowance for credit losses on lending related commitments	152,000,000	94,000,000
Other liabilities, fair value	964,000,000	607,000,000
Long-term debt, fair value	$ 399,000,000	$ 387,000,000