Deposits - Noninterest and Interest-bearing (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
U.S. offices
Noninterest-bearing	$ 369,505	$ 393,645
Interest-bearing (included $19,691 and $14,947 at fair value)	831,085	793,618
Total deposits in U.S. offices	1,200,590	1,187,263
Non-U.S. offices
Noninterest-bearing	19,092	15,576
Interest-bearing (included $3,526 and $6,374 at fair value)	250,984	241,143
Total deposits in non-U.S. offices	270,076	256,719
Total deposits	1,470,666	1,443,982
Fair value
U.S. offices
Interest-bearing, fair value	19,691	14,947
Non-U.S. offices
Interest-bearing, fair value	$ 3,526	$ 6,374