SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	$ 2,936	$ 2,332	$ 625	$ 1,979
Other comprehensive income loss before reclassifications net of tax	[1]	2,488	(1,782)	4,849	(1,396)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	8	(43)	(42)	(76)
Other comprehensive income (loss), net of tax	[1]	2,496	(1,825)	4,807	(1,472)
Balance, end of period	[1]	5,432	507	5,432	507
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(1,584)	(2,540)	(2,196)	(2,541)
Other comprehensive income loss before reclassifications net of tax	[1]	737	(185)	1,349	(184)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	737	(185)	1,349	(184)
Balance, end of period	[1]	(847)	(2,725)	(847)	(2,725)
Unrealized gains (losses) on investment securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	4,684	5,026	2,986	4,672
Other comprehensive income loss before reclassifications net of tax	[1]	1,750	(1,598)	3,498	(1,211)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	7	(44)	(43)	(77)
Other comprehensive income (loss), net of tax	[1]	1,757	(1,642)	3,455	(1,288)
Balance, end of period	[1]	6,441	3,384	6,441	3,384
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(24)	(28)	(26)	(26)
Other comprehensive income loss before reclassifications net of tax	[1]	5	1	7	(1)
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	5	1	7	(1)
Balance, end of period	[1]	(19)	(27)	(19)	(27)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	[1]	(140)	(126)	(139)	(126)
Other comprehensive income loss before reclassifications net of tax	[1]	(4)	0	(5)	0
Amounts reclassified from accumulated other comprehensive income net of tax	[1]	1	1	1	1
Other comprehensive income (loss), net of tax	[1]	(3)	1	(4)	1
Balance, end of period	[1]	$ (143)	$ (125)	$ (143)	$ (125)

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