INVESTMENTS - Recognition and Measurement of OTTI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OTTI on Investments disclosures
Total OTTI losses recognized during the period	$ 1	$ 0
Less: Impairments recognized in AOCI	0	0
Net impairment losses recognized in earnings for securities that the Company does not intend to sell nor will likely be required to sell	1	0
Impairment losses recognized in earnings for securities that the Company intends to sell, would be more likely than not required to sell or will be subject to an issuer call deemed probable of exercise and FX losses	464	72
Total impairment losses recognized in earnings	465	72
Securities available-for-sale (AFS)
OTTI on Investments disclosures
Total OTTI losses recognized during the period	1	0
Less: Impairments recognized in AOCI	0	0
Net impairment losses recognized in earnings for securities that the Company does not intend to sell nor will likely be required to sell	1	0
Impairment losses recognized in earnings for securities that the Company intends to sell, would be more likely than not required to sell or will be subject to an issuer call deemed probable of exercise and FX losses	195	69
Total impairment losses recognized in earnings	196	69
Held-to-maturity Securities
OTTI on Investments disclosures
Total OTTI losses recognized during the period	0	0
Less: Impairments recognized in AOCI	0	0
Net impairment losses recognized in earnings for securities that the Company does not intend to sell nor will likely be required to sell	0	0
Impairment losses recognized in earnings for securities that the Company intends to sell, would be more likely than not required to sell or will be subject to an issuer call deemed probable of exercise and FX losses	7	3
Total impairment losses recognized in earnings	7	3
Other assets
OTTI on Investments disclosures
Total OTTI losses recognized during the period	0	0
Less: Impairments recognized in AOCI	0	0
Net impairment losses recognized in earnings for securities that the Company does not intend to sell nor will likely be required to sell	0	0
Impairment losses recognized in earnings for securities that the Company intends to sell, would be more likely than not required to sell or will be subject to an issuer call deemed probable of exercise and FX losses	262	0
Total impairment losses recognized in earnings	262	$ 0
VENEZUELA | Securities available-for-sale (AFS)
OTTI on Investments disclosures
Total impairment losses recognized in earnings	$ 160