Net interest revenue (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020		Dec. 31, 2019	Mar. 31, 2019
Interest revenue
Deposits with the Federal Reserve and other central banks		$ 80		$ 94	$ 139
Deposits with banks		58		65	63
Federal funds sold and securities purchased under resale agreements		396		452	474
Margin loans		87		96	135
Non-margin loans		309		328	355
Securities:
Taxable		594		639	706
Exempt from federal income taxes		6		7	12
Total securities		600		646	718
Trading securities		40		40	36
Total interest revenue		1,570		1,721	1,920
Interest expense
Deposits		240		334	391
Federal funds purchased and securities sold under repurchase agreements		275		291	331
Trading liabilities		7		9	7
Other borrowed funds		4		5	24
Commercial paper		6		7	8
Customer payables		30		40	70
Long-term debt		194		220	248
Total interest expense		756		906	1,079
Net interest revenue		814		815	841
Provision for credit losses	[2]	169	[1]	(8)	7	[1]
Net interest revenue after provision for credit losses		$ 645		$ 823	$ 834

[1] In the first quarter of 2020, we adopted new accounting guidance included in ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses On Financial Instruments, on a prospective basis. See Note 2 of the Notes to Consolidated Financial Statements for additional information.

[2] The provision for credit losses for the quarter ended March 31, 2020 relates to the financial instruments within the scope of Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses On Financial Instruments. See Note 2 of the Notes to Consolidated Financial Statements for additional information.