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The cash inflow from securitizing loans held with the intention to resell in the near future.

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SECURITIES - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
SECURITIES - Narrative (Details) - USD ($)	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Impaired debt securities sold	$ 0	$ 0	$ 0	$ 0
Pretax non-credit related losses were deferred in OCI			34,000,000	29,000,000
Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Cumulative credit losses recognized in earnings	73,000,000	62,000,000	73,000,000	62,000,000	$ 73,000,000	$ 66,000,000	$ 66,000,000	$ 62,000,000	$ 62,000,000
Credit impairments recognized in earnings on securities that have been previously impaired	7,000,000	2,000,000	8,000,000	3,000,000	5,000,000
Reductions due to increases in cash flow expectations on impaired securities	0	2,000,000	1,000,000	3,000,000
Held-to-maturity Securities
Schedule of Available-for-sale Securities [Line Items]
Cumulative credit losses recognized in earnings	0	0	0	0	$ 0
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securitizations of mortgage loans	$ 5,000,000	$ 0	$ 5,000,000	$ 0