DISCONTINUED OPERATIONS AND SIGNIFICANT DISPOSALS - Significant Disposals (Details) loan in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2017 USD ($) employee branch loan	Mar. 31, 2016 USD ($)
Discontinued operations
Pre-tax gain (loss) on sale	[1]	$ 19	$ 422
Disposed of by sale, not discontinued operations | Novation of 80% Primerica Coinsurance Agreement
Discontinued operations
Coinsurance agreement percentage			80.00%
Pre-tax gain (loss) on sale			$ 404
After tax gain (loss) on sale of disposal group			263
AFS securities and cash			1,500
Deferred policy acquisition costs			950
Insurance liabilities			2,700
Disposed of by sale, not discontinued operations | US Mortgage Servicing Operations
Discontinued operations
Pre-tax gain (loss) on sale		(331)
After tax gain (loss) on sale of disposal group		$ (207)
Number of loans disposed of | loan		750
Loans, net		$ 93,000
Servicing related assets		1,162
Mortgage servicing rights		1,046
Loss on disposal including other costs relating to disposal		382
Disposed of by sale, not discontinued operations | CitiFinancial Canada
Discontinued operations
Pre-tax gain (loss) on sale		350
After tax gain (loss) on sale of disposal group		178
Insurance liabilities		1,500
Loans, net		$ 1,700
Number of branches | branch		220
Number of employees | employee		1,400
Assets		$ 1,900
Amount of debt settled		400
Income before taxes		$ 30	$ 21

[1] See Note 2 to the Consolidated Financial Statements for further information on significant disposals.