CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 338	$ 286
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (benefit) for loan losses	(113)	(69)
Depreciation and amortization (including discount amortization and accretion)	124	112
Gains on securities and other, net	(17)	(20)
Share-based compensation	21	14
Deferred tax expense	192	114
Other	(3)	4
Net effect of changes in assets and liabilities:
Decrease (increase) in cash required to be segregated under federal or other regulations	571	(764)
Increase in receivables from brokers, dealers and clearing organizations	(189)	(172)
(Increase) decrease in margin receivables	(1,042)	574
Increase in other assets	(22)	0
Increase in payables to brokers, dealers and clearing organizations	490	168
(Decrease) increase in customer payables	(167)	168
Decrease in other liabilities	(11)	(75)
Net cash provided by operating activities	172	340
Cash flows from investing activities:
Purchases of available-for-sale securities	(6,348)	(3,687)
Proceeds from sales of available-for-sale securities	795	1,621
Proceeds from maturities of and principal payments on available-for-sale securities	701	681
Purchases of held-to-maturity securities	(6,840)	(3,122)
Proceeds from maturities of and principal payments on held-to-maturity securities	1,107	864
Proceeds from sale of loans	40	0
Decrease in loans receivable	555	579
Capital expenditures for property and equipment	(50)	(38)
Proceeds from sale of real estate owned and repossessed assets	16	10
Net cash flow from derivative contracts	51	(56)
Other	(19)	(4)
Net cash used in investing activities	(9,992)	(3,152)
Cash flows from financing activities:
Increase in deposits	8,390	3,519
Preferred stock dividends	(13)	0
Net increase (decrease) in securities sold under agreements to repurchase	400	(82)
Advances from FHLB	400	0
Payments on advances from FHLB	(200)	0
Repurchases of common stock	0	(452)
Other	(16)	(13)
Net cash provided by financing activities	8,961	2,972
(Decrease) increase in cash and equivalents	(859)	160
Cash and equivalents, beginning of period	1,950	2,233
Cash and equivalents, end of period	1,091	2,393
Supplemental disclosures:
Cash paid for interest	41	59
Cash paid for income taxes, net of refunds	5	5
Non-cash investing and financing activities:
Transfers of loans held-for-investment to loans held-for-sale	40	0
Transfers from loans to other real estate owned and repossessed assets	15	14
Conversion of convertible debentures to common stock	3	5
Transfer of available-for-sale securities to held-to-maturity securities	$ 0	$ 492