SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	$ 507	$ 1,606	$ 1,979	$ (563)
Other comprehensive income loss before reclassifications net of tax	[1]	(69)	(89)	(1,465)	2,076
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	90	(17)	14	(13)
Other comprehensive income (loss), net of tax	[1]	21	(106)	(1,451)	2,063
Balance, end of period	[1]	528	1,500	528	1,500
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(2,725)	(1,216)	(2,541)	(1,505)
Other comprehensive income loss before reclassifications net of tax	[1]	192	(589)	8	(300)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	192	(589)	8	(300)
Balance, end of period	[1]	(2,533)	(1,805)	(2,533)	(1,805)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	3,384	2,915	4,672	1,035
Other comprehensive income loss before reclassifications net of tax	[1]	(260)	505	(1,471)	2,379
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	90	(18)	13	(12)
Other comprehensive income (loss), net of tax	[1]	(170)	487	(1,458)	2,367
Balance, end of period	[1]	3,214	3,402	3,214	3,402
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(27)	(11)	(26)	(12)
Other comprehensive income loss before reclassifications net of tax	[1]	(1)	(6)	(2)	(5)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	(1)	(6)	(2)	(5)
Balance, end of period	[1]	(28)	(17)	(28)	(17)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(125)	(82)	(126)	(81)
Other comprehensive income loss before reclassifications net of tax	[1]	0	1	0	2
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	1	1	(1)
Other comprehensive income (loss), net of tax	[1]	0	2	1	1
Balance, end of period	[1]	$ (125)	$ (80)	$ (125)	$ (80)

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