SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	$ 625	$ 1,979
Other comprehensive income loss before reclassifications net of tax	[1]	2,361	385
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	(50)	(32)
Other comprehensive income (loss), net of tax	[1]	2,311	353
Balance, end of period	[1]	2,936	2,332
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(2,196)	(2,541)
Other comprehensive income loss before reclassifications net of tax	[1]	612	1
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0
Other comprehensive income (loss), net of tax	[1]	612	1
Balance, end of period	[1]	(1,584)	(2,540)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	2,986	4,672
Other comprehensive income loss before reclassifications net of tax	[1]	1,748	386
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	(50)	(32)
Other comprehensive income (loss), net of tax	[1]	1,698	354
Balance, end of period	[1]	4,684	5,026
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(26)	(26)
Other comprehensive income loss before reclassifications net of tax	[1]	2	(2)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0
Other comprehensive income (loss), net of tax	[1]	2	(2)
Balance, end of period	[1]	(24)	(28)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(139)	(126)
Other comprehensive income loss before reclassifications net of tax	[1]	(1)	0
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0
Other comprehensive income (loss), net of tax	[1]	(1)	0
Balance, end of period	[1]	$ (140)	$ (126)

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