Income Taxes - Schedule of Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Unrealized losses on investment securities, net	$ 17	$ 157
Deferred compensation	159	285
Defined benefit pension plan	82	116
Restructuring charges and other reserves	132	199
Foreign currency translation	18	225
General business credit	231	425
NOL and other carryforwards	101	73
Other	27	32
Total deferred tax assets	767	1,512
Valuation allowance for deferred tax assets	(88)	(66)
Deferred tax assets, net of valuation allowance	679	1,446
Deferred tax liabilities:
Leveraged lease financing	184	313
Fixed and intangible assets	755	886
Non-U.S. earnings	6	164
Investment basis differences	158	120
Total deferred tax liabilities	$ 1,103	$ 1,483