SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ 1,979	[1]	$ (563)	[1]
Other comprehensive income loss before reclassifications net of tax	385	[1]	894	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	(32)	[1]	(24)	[1]
Other comprehensive income (loss), net of tax	353	[1]	870	[1]
Balance, end of period	2,332	[1]	307	[1]
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(2,541)	[1]	(1,505)	[1]
Other comprehensive income loss before reclassifications net of tax	1	[1]	(14)	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	0	[1]	(23)	[1]
Other comprehensive income (loss), net of tax	1	[1]	(37)	[1]
Balance, end of period	(2,540)	[1]	(1,542)	[1]
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	4,672	[1]	1,035	[1]
Other comprehensive income loss before reclassifications net of tax	386	[1]	910	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	(32)	[1]	(1)	[1]
Other comprehensive income (loss), net of tax	354	[1]	909	[1]
Balance, end of period	5,026	[1]	1,944	[1]
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(26)	[1]	(12)	[1]
Other comprehensive income loss before reclassifications net of tax	(2)	[1]	(1)	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	0	[1]	0	[1]
Other comprehensive income (loss), net of tax	(2)	[1]	(1)	[1]
Balance, end of period	(28)	[1]	(13)	[1]
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(126)	[1]	(81)	[1]
Other comprehensive income loss before reclassifications net of tax	0	[1]	(1)	[1]
Amounts reclassified from accumulated other comprehensive income net of tax	0	[1]	0	[1]
Other comprehensive income (loss), net of tax	0	[1]	(1)	[1]
Balance, end of period	$ (126)	[1]	$ (82)	[1]

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