SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	$ 5,432	$ 507	$ 625	$ 1,979
Other comprehensive income loss before reclassifications net of tax	[1]	(90)	(69)	4,757	(1,465)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	22	90	(18)	14
Other comprehensive income (loss), net of tax	[1]	(68)	21	4,739	(1,451)
Balance, end of period	[1]	5,364	528	5,364	528
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(847)	(2,725)	(2,196)	(2,541)
Other comprehensive income loss before reclassifications net of tax	[1]	253	192	1,602	8
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	253	192	1,602	8
Balance, end of period	[1]	(594)	(2,533)	(594)	(2,533)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	6,441	3,384	2,986	4,672
Other comprehensive income loss before reclassifications net of tax	[1]	(342)	(260)	3,155	(1,471)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	21	90	(21)	13
Other comprehensive income (loss), net of tax	[1]	(321)	(170)	3,134	(1,458)
Balance, end of period	[1]	6,120	3,214	6,120	3,214
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(19)	(27)	(26)	(26)
Other comprehensive income loss before reclassifications net of tax	[1]	0	(1)	7	(2)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	0	(1)	7	(2)
Balance, end of period	[1]	(19)	(28)	(19)	(28)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(143)	(125)	(139)	(126)
Other comprehensive income loss before reclassifications net of tax	[1]	(1)	0	(7)	0
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	1	0	3	1
Other comprehensive income (loss), net of tax	[1]	0	0	(4)	1
Balance, end of period	[1]	$ (143)	$ (125)	$ (143)	$ (125)

[1] All amounts in the table above are net of tax.