Consolidated Statements of Comprehensive Income Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 1,878		$ 1,933	$ 1,774
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(197)		(163)	375
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(244)		(10)	(182)
Other Comprehensive Income (Loss), Brokered Time Deposits, Net of Tax	(1)		0	0
Other Comprehensive Income (Loss), Long Term Debt, Adjustment, Net of Tax	(2)	[1]	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	88		(165)	(26)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(356)		(338)	167
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 1,522		$ 1,595	$ 1,941

[1] 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 21, "Accumulated Other Comprehensive (Loss)/Income," for additional information.