SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ (563)	[1]	$ 2,715	[1]
Other comprehensive income loss before reclassifications net of tax	2,578	[1]	(3,247)	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	(36)	[1]	(31)	[1]
Other comprehensive income (loss), net of income taxes	2,542	[1]	(3,278)	[1]	750
Balance, end of period	1,979	[1]	(563)	[1]	2,715	[1]
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(1,505)	[1]	333	[1]
Other comprehensive income loss before reclassifications net of tax	(1,036)	[1]	(1,833)	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	0	[1]	(5)	[1]
Other comprehensive income (loss), net of income taxes	(1,036)	[1]	(1,838)	[1]
Balance, end of period	(2,541)	[1]	(1,505)	[1]
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	1,035	[1]	2,570	[1]
Other comprehensive income loss before reclassifications net of tax	3,672	[1]	(1,499)	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	(35)	[1]	(36)	[1]
Other comprehensive income (loss), net of income taxes	3,637	[1]	(1,535)	[1]
Balance, end of period	4,672	[1]	1,035	[1]
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(12)	[1]	(5)	[1]
Other comprehensive income loss before reclassifications net of tax	(14)	[1]	(7)	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	0	[1]	0	[1]
Other comprehensive income (loss), net of income taxes	(14)	[1]	(7)	[1]
Balance, end of period	(26)	[1]	(12)	[1]
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(81)	[1]	(183)	[1]
Other comprehensive income loss before reclassifications net of tax	(44)	[1]	92	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	(1)	[1]	10	[1]
Other comprehensive income (loss), net of income taxes	(45)	[1]	102	[1]
Balance, end of period	$ (126)	[1]	$ (81)	[1]

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