Consolidated Statements of Comprehensive Income Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 2,273	$ 1,878	[1]	$ 1,933	[2]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	61	(197)		(163)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(87)	(244)		(10)
Other Comprehensive Income (Loss), Brokered Time Deposits, Net of Tax	0	(1)		0
Other Comprehensive Income (Loss), Long Term Debt, Adjustment, Net of Tax	3	(2)		0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	24	88		(165)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1	(356)		(338)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 2,274	$ 1,522		$ 1,595

[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 year ended December 31, 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 year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.