Taxes on Income (Temporary Differences That Created Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Employee compensation, severance, and benefits	$ 221	$ 213
Net unrealized loss on securities available for sale	80
Facilities lease commitments	28	30
Reserves and allowances	28	25
State and local taxes	14	12
Net operating loss carryforwards	6	6
Other	1
Total deferred tax assets	378	286
Valuation allowance	(4)	(4)
Deferred tax assets - net of valuation allowance	374	282
Deferred tax liabilities:
Depreciation and amortization	(115)	(125)
Net unrealized gain on securities available for sale		(98)
Capitalized internal-use software development costs	(97)	(76)
Deferred cancellation of debt income	(6)	(9)
Deferred loan costs	(5)	(7)
Deferred Senior Note exchange	(6)	(6)
Total deferred tax liabilities	(229)	$ (321)
Deferred tax asset (liability) – net	$ 145
Total deferred tax liabilities		$ (39)