CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Income from continuing operations, net of tax	$ 2,117	$ 3,770	$ 4,012
Income (loss) from discontinued operations, net of tax	(135)	(19)	38
Net income	1,982	3,751	4,050
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan, lease and other losses	7,551	6,459	4,536
Depreciation and amortization, net	2,440	2,428	2,100
Deferred tax benefit	1,434	(686)	(402)
Net (gains) losses on sales of securities available for sale	(70)	(6)	2
Impairment losses on securities available for sale	5	17	30
Gain on sales of loans held for sale	(72)	(80)	(86)
Stock-based compensation expense	244	239	161
Other	(8)	(11)	0
Loans held for sale:
Originations and purchases	(8,929)	(8,645)	(6,942)
Proceeds from sales and paydowns	9,595	8,390	6,805
Changes in operating assets and liabilities:
Changes in interest receivable	(157)	(159)	(72)
Changes in other assets	(714)	(1,907)	(596)
Changes in interest payable	85	28	45
Changes in other liabilities	1,157	2,013	575
Net change from discontinued operations	(361)	25	(79)
Net cash from operating activities	14,182	11,856	10,127
Securities available for sale:
Purchases	(12,412)	(14,154)	(12,200)
Proceeds from paydowns and maturities	7,213	7,867	7,742
Proceeds from sales	8,181	4,146	4,379
Securities held to maturity:
Purchases	(5,885)	(3,787)	(4,277)
Proceeds from paydowns and maturities	2,594	2,681	2,163
Loans:
Net changes in loans held for investment	(12,315)	(22,036)	(18,575)
Principal recoveries of loans previously charged off	1,951	1,493	1,498
Purchases of premises and equipment	(1,018)	(779)	(532)
Payments to Acquire Businesses, Net of Cash Acquired	(3,187)	(629)	(9,314)
Net cash from other investing activities	(663)	(432)	(610)
Net cash from investing activities	(15,541)	(25,630)	(29,726)
Financing activities:
Changes in deposits	6,993	19,031	12,163
Proceeds from Issuance of Secured Debt	5,983	6,259	5,062
Maturities and paydowns of securitized debt obligations	(7,233)	(3,540)	(500)
Issuance of senior and subordinated notes and long-term FHLB advances	35,426	22,984	31,830
Maturities and paydowns of senior and subordinated notes and long-term FHLB advances	(36,554)	(24,170)	(9,579)
Changes in other borrowings	(400)	11	(16,066)
Common stock:
Net proceeds from issuances	164	131	111
Dividends paid	(780)	(812)	(816)
Preferred stock:
Proceeds from Issuance of Preferred Stock	0	1,066	1,472
Dividends paid	(265)	(214)	(158)
Purchases of treasury stock	(240)	(3,661)	(2,441)
Proceeds from share-based payment activities	124	142	85
Net cash from financing activities	3,218	17,227	21,163
Changes in cash, cash equivalents and restricted cash for securitization investors	1,859	3,453	1,564
Cash, cash equivalents and restricted cash for securitization investors, beginning of the period	12,493	9,040	7,476
Cash, cash equivalents and restricted cash for securitization investors, ending of the period	14,352	12,493	9,040
Non-cash items:
Net transfers from loans held for investment to loans held for sale	674	552	268
Securitized debt obligations assumed in acquisition	2,484
Loans held for sale acquired by assuming other borrowings	283	0	0
Interest paid	2,772	2,250	1,643
Income tax paid	1,187	2,121	1,732
Cabela [Member]
Loans:
Payments to Acquire Businesses, Net of Cash Acquired	$ (3,200)
Securitized debt obligations assumed in acquisition		$ 0	$ 0