SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	$ 2,630	$ 625
Other comprehensive income loss before reclassifications net of tax	[1]	(10)	2,361
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	12	(50)
Other comprehensive income (loss), net of tax	[1]	2	2,311
Balance, end of period	[1]	2,632	2,936
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(1,983)	(2,196)
Other comprehensive income loss before reclassifications net of tax	[1]	333	612
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0
Other comprehensive income (loss), net of tax	[1]	333	612
Balance, end of period	[1]	(1,650)	(1,584)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	4,805	2,986
Other comprehensive income loss before reclassifications net of tax	[1]	(341)	1,748
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	10	(50)
Other comprehensive income (loss), net of tax	[1]	(331)	1,698
Balance, end of period	[1]	4,474	4,684
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(24)	(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]	(22)	(24)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(168)	(139)
Other comprehensive income loss before reclassifications net of tax	[1]	(4)	(1)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	2	0
Other comprehensive income (loss), net of tax	[1]	(2)	(1)
Balance, end of period	[1]	$ (170)	$ (140)

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