Income Taxes And Tax-Related Items Principal Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses	$ 256	$ 223
Deferred compensation	91	113
Deferred loan origination fees and costs	20	24
Net unrealized losses on investment securities available-for-sale	20	0
Other temporary differences, net	76	69
Total deferred tax asset before valuation allowance	463	429
Valuation allowance	(3)	(3)
Total deferred tax assets	460	426
Deferred tax liabilities:
Lease financing transactions	(150)	(183)
Defined benefit plans	(82)	(32)
Net unrealized gains on investment securities available-for-sale	0	(5)
Allowance for depreciation	(11)	(7)
Total deferred tax liabilities	(243)	(227)
Net deferred tax asset	$ 217	$ 199