Parent Company - Condensed Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Trading assets at fair value	$ 294,869	$ 312,738
Investment securities	182,998	182,154
Equity investments in subsidiaries:
Other assets	23,491	21,742
Total assets	1,188,140	1,115,862
Liabilities
Trading liabilities at fair value	158,328	157,631
Securities sold under agreements to repurchase from affiliates	62,188	50,587
Other liabilities and accrued expenses	29,300	25,603
Borrowings	233,127	217,079
Total liabilities	1,081,542	1,012,713
Equity
Preferred stock	7,750	9,250
Common stock	20	20
Additional paid-in capital	28,841	25,546
Retained earnings	89,432	78,694
Employee stock trusts	3,955	3,043
Accumulated other comprehensive income (loss)	(3,102)	(1,962)
Common stock held in treasury at cost	(17,500)	(9,767)
Common stock issued to employee stock trusts	(3,955)	(3,043)
Total equity	106,598	103,149	$ 82,697
Total liabilities and equity	1,188,140	1,115,862
Statement of Financial Position Parenthetical Disclosures [Abstract]
Investment securities at fair value	102,830	110,383
Borrowings at fair value	$ 76,340	$ 73,701
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	3,500,000,000	3,500,000,000
Common stock issued (in shares)	2,038,893,979	2,038,893,979
Common stock outstanding (in shares)	1,772,226,530	1,809,624,144	1,594,000,000
Treasury stock (in shares)	266,667,449	229,269,835
Parent Company
Assets
Cash and cash equivalents	$ 15,342	$ 7,102
Trading assets at fair value	5,298	6,862
Investment securities	39,707	39,225
Securities purchased under agreement to resell to affiliates	21,116	34,698
Advances to subsidiaries:
Bank and BHC	59,757	22,692
Non-bank	96,202	121,731
Equity investments in subsidiaries:
Bank and BHC	69,059	52,951
Non-bank	48,481	47,450
Other assets	1,109	454
Total assets	356,071	333,165
Liabilities
Trading liabilities at fair value	1,688	1,623
Securities sold under agreements to repurchase from affiliates	16,928	24,349
Payables to and advances from subsidiaries	59,960	43,252
Other liabilities and accrued expenses	1,859	2,181
Borrowings	170,195	159,979
Total liabilities	250,630	231,384
Equity
Preferred stock	7,750	9,250
Common stock	20	20
Additional paid-in capital	28,841	25,546
Retained earnings	89,432	78,694
Employee stock trusts	3,955	3,043
Accumulated other comprehensive income (loss)	(3,102)	(1,962)
Common stock held in treasury at cost	17,500	9,767
Common stock issued to employee stock trusts	3,955	3,043
Total equity	105,441	101,781
Total liabilities and equity	356,071	333,165
Statement of Financial Position Parenthetical Disclosures [Abstract]
Investment securities at fair value	21,246	20,037
Investment securities pledged to various parties	16,573	24,248
Borrowings at fair value	$ 15,894	$ 18,804
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	3,500,000,000	3,500,000,000
Common stock issued (in shares)	2,038,893,979	2,038,893,979
Common stock outstanding (in shares)	1,772,226,530	1,809,624,144
Treasury stock (in shares)	266,667,449	229,269,835