Consolidated Statements of Comprehensive Income Consolidated Statement of Comprehensive Income - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent		$ 538	$ 474	[1]	$ 1,533	$ 1,413	[2]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		40	(32)		97	383
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax		(2)	(86)		(13)	137
Other Comprehensive Income (Loss), Brokered Time Deposits, Net of Tax		0	0		0	0
Other Comprehensive Income (Loss), Long Term Debt, Adjustment, Net of Tax	[3]	1	(3)		1	(5)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		3	3		1	65
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		42	(118)		86	580
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ 580	$ 356		$ 1,619	$ 1,993

[1] Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the three months ended September 30, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.

[2] Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the nine months ended September 30, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.

[3] Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1, "Significant Accounting Policies," and Note 17, "Accumulated Other Comprehensive (Loss)/Income," for additional information.