INVESTMENTS - Recognition and Measurement of OTTI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
OTTI on Investments disclosures
Total OTTI losses recognized during the period	$ 0	$ 1	$ 4	$ 1
Less: portion of impairment loss recognized in AOCI (before taxes)	0	0	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	1	4	1
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	32	79	611	194
Total impairment losses recognized in earnings	32	80	615	195
Securities available-for-sale (AFS)
OTTI on Investments disclosures
Total OTTI losses recognized during the period	0	1	3	1
Less: portion of impairment loss recognized in AOCI (before taxes)	0	0	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	1	3	1
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	20	64	243	152
Total impairment losses recognized in earnings	20	65	246	153
Held-to-maturity Securities
OTTI on Investments disclosures
Total OTTI losses recognized during the period	0	0	1	0
Less: portion of impairment loss recognized in AOCI (before taxes)	0	0	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	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	12	14	36	36
Total impairment losses recognized in earnings	12	14	37	36
Other Assets
OTTI on Investments disclosures
Total OTTI losses recognized during the period	0	0	0	0
Less: portion of impairment loss recognized in AOCI (before taxes)	0	0	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	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	0	1	332	6
Total impairment losses recognized in earnings	$ 0	$ 1	332	$ 6
VENEZUELA | Securities available-for-sale (AFS)
OTTI on Investments disclosures
Total impairment losses recognized in earnings			$ 160