SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	$ 2,332	$ 307	$ 1,979	$ (563)
Other comprehensive income loss before reclassifications net of tax	[1]	(1,782)	1,294	(1,396)	2,165
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	(43)	5	(76)	4
Other comprehensive income (loss), net of tax	[1]	(1,825)	1,299	(1,472)	2,169
Balance, end of period	[1]	507	1,606	507	1,606
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(2,540)	(1,542)	(2,541)	(1,505)
Other comprehensive income loss before reclassifications net of tax	[1]	(185)	326	(184)	289
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	(185)	326	(184)	289
Balance, end of period	[1]	(2,725)	(1,216)	(2,725)	(1,216)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	5,026	1,944	4,672	1,035
Other comprehensive income loss before reclassifications net of tax	[1]	(1,598)	964	(1,211)	1,874
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	(44)	7	(77)	6
Other comprehensive income (loss), net of tax	[1]	(1,642)	971	(1,288)	1,880
Balance, end of period	[1]	3,384	2,915	3,384	2,915
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(28)	(13)	(26)	(12)
Other comprehensive income loss before reclassifications net of tax	[1]	1	2	(1)	1
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	1	2	(1)	1
Balance, end of period	[1]	(27)	(11)	(27)	(11)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(126)	(82)	(126)	(81)
Other comprehensive income loss before reclassifications net of tax	[1]	0	2	0	1
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	1	(2)	1	(2)
Other comprehensive income (loss), net of tax	[1]	1	0	1	(1)
Balance, end of period	[1]	$ (125)	$ (82)	$ (125)	$ (82)

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