Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Operating Activities:
Net income	$ 508	$ 659
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax (benefit)	(35)	(33)
Amortization of other intangible assets	60	50	$ 226
Other non-cash adjustments for depreciation, amortization and accretion, net	244	248
(Gains) losses related to investment securities, net	1	2
Change in trading account assets, net	4	(85)
Change in accrued interest and fees receivable, net	(74)	(84)
Change in collateral deposits, net	(1,527)	6,011
Change in unrealized (gains) losses on foreign exchange derivatives, net	(63)	(2,205)
Change in other assets, net	(732)	(993)
Change in accrued expenses and other liabilities, net	976	1,091
Other, net	143	175
Net cash (used in) provided by operating activities	(495)	4,836
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	19,176	(12,191)
Net (increase) decrease in securities purchased under resale agreements	3,157	(1,895)
Proceeds from sales of available-for-sale securities	152	11,720
Proceeds from maturities of available-for-sale securities	3,959	4,438
Purchases of available-for-sale securities	(7,408)	(3,922)
Proceeds from maturities of held-to-maturity securities	2,606	1,155
Purchases of held-to-maturity securities	(2,348)	(1,860)
Net decrease (increase) in loans and leases	2,409
Net decrease (increase) in loans and leases		(6,280)
Business acquisitions, net of cash acquired	(54)	0
Purchases of equity investments and other long-term assets	(71)	(8)
Purchases of premises and equipment, net	(171)	(147)
Other, net	264	17
Net cash provided by (used in) investing activities	21,671	(8,973)
Financing Activities:
Net (decrease) in time deposits	(5,876)	(1,789)
Net (decrease) increase in all other deposits	(12,013)	8,410
Net increase (decrease) in other short-term borrowings	(1,807)	(900)
Payments for long-term debt and obligations under capital leases	(31)	(515)
Repurchases of common stock	(300)	(350)
Repurchases of common stock for employee tax withholding	(43)	(70)
Payments for cash dividends	(234)	(210)
Net cash (used in) provided by financing activities	(20,304)	4,576
Net increase	872	439
Cash and due from banks at beginning of period	3,597	2,107	2,107
Cash and due from banks at end of period	$ 4,469	$ 2,546	$ 3,597