SHAREOWNERS' EQUITY - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			$ 77,491,000,000
Reclassifications from OCI – net of deferred taxes	$ 467,000,000	$ 461,000,000	1,525,000,000	$ 946,000,000
Other comprehensive income (loss)	1,318,000,000	810,000,000	3,151,000,000	1,636,000,000
Less OCI attributable to noncontrolling interests	1,000,000	3,000,000	7,000,000	6,000,000
Accumulated other comprehensive income (loss) at June 30	75,783,000,000	86,684,000,000	75,783,000,000	86,684,000,000
Investment securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	622,000,000	680,000,000	674,000,000	460,000,000
Other comprehensive income (loss) (OCI) before reclassifications – net of deferred taxes	291,000,000	419,000,000	309,000,000	578,000,000
Reclassifications from OCI – net of deferred taxes	(48,000,000)	(21,000,000)	(118,000,000)	39,000,000
Other comprehensive income (loss)	243,000,000	397,000,000	191,000,000	617,000,000
Less OCI attributable to noncontrolling interests	0	0	0	0
Accumulated other comprehensive income (loss) at June 30	866,000,000	1,077,000,000	866,000,000	1,077,000,000
Deferred taxes, other comprehensive income (loss) (OCI) before reclassifications	146,000,000	222,000,000	159,000,000	304,000,000
Deferred taxes, reclassifications from OCI	(25,000,000)	(9,000,000)	(61,000,000)	31,000,000
Currency translation adjustments (CTA)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(6,004,000,000)	(5,500,000,000)	(6,816,000,000)	(5,499,000,000)
Other comprehensive income (loss) (OCI) before reclassifications – net of deferred taxes	491,000,000	26,000,000	753,000,000	141,000,000
Reclassifications from OCI – net of deferred taxes	34,000,000	29,000,000	588,000,000	(85,000,000)
Other comprehensive income (loss)	525,000,000	55,000,000	1,341,000,000	57,000,000
Less OCI attributable to noncontrolling interests	2,000,000	3,000,000	6,000,000	6,000,000
Accumulated other comprehensive income (loss) at June 30	(5,481,000,000)	(5,448,000,000)	(5,481,000,000)	(5,448,000,000)
Deferred taxes, other comprehensive income (loss) (OCI) before reclassifications	(207,000,000)	(50,000,000)	(241,000,000)	217,000,000
Deferred taxes, reclassifications from OCI	(1,000,000)	(39,000,000)	(541,000,000)	80,000,000
Cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	32,000,000	(26,000,000)	12,000,000	(80,000,000)
Other comprehensive income (loss) (OCI) before reclassifications – net of deferred taxes	44,000,000	(15,000,000)	64,000,000	(40,000,000)
Reclassifications from OCI – net of deferred taxes	(54,000,000)	(10,000,000)	(55,000,000)	69,000,000
Other comprehensive income (loss)	(10,000,000)	(25,000,000)	9,000,000	30,000,000
Less OCI attributable to noncontrolling interests	0	0	0	0
Accumulated other comprehensive income (loss) at June 30	22,000,000	(51,000,000)	22,000,000	(51,000,000)
Deferred taxes, other comprehensive income (loss) (OCI) before reclassifications	(8,000,000)	2,000,000	(2,000,000)	(5,000,000)
Deferred taxes, reclassifications from OCI	(10,000,000)	(4,000,000)	(9,000,000)	1,000,000
Benefit plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(11,421,000,000)	(10,859,000,000)	(12,469,000,000)	(11,410,000,000)
Reclassifications from OCI – net of deferred taxes	536,000,000	463,000,000	1,110,000,000	922,000,000
Other comprehensive income (loss)	560,000,000	382,000,000	1,610,000,000	933,000,000
Less OCI attributable to noncontrolling interests	(1,000,000)	0	1,000,000	(1,000,000)
Accumulated other comprehensive income (loss) at June 30	(10,860,000,000)	(10,476,000,000)	(10,860,000,000)	(10,476,000,000)
Deferred taxes, reclassifications from OCI	270,000,000	237,000,000	558,000,000	474,000,000
Prior service credit (costs) - net of deferred taxes of $0, $0, $0 and $5
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss) (OCI) before reclassifications – net of deferred taxes	0	0	0	23,000,000
Reclassifications from OCI – net of deferred taxes	10,000,000	17,000,000	21,000,000	33,000,000
Deferred taxes, other comprehensive income (loss) (OCI) before reclassifications	0	0	0	5,000,000
Deferred taxes, reclassifications from OCI	19,000,000	20,000,000	38,000,000	41,000,000
Net actuarial gain (loss) – net of deferred taxes of $32, $(65), $133 and $(43)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss) (OCI) before reclassifications – net of deferred taxes	24,000,000	(80,000,000)	500,000,000	(12,000,000)
Reclassifications from OCI – net of deferred taxes	526,000,000	447,000,000	1,059,000,000	890,000,000
Deferred taxes, other comprehensive income (loss) (OCI) before reclassifications	32,000,000	(65,000,000)	133,000,000	(43,000,000)
Deferred taxes, reclassifications from OCI	251,000,000	217,000,000	504,000,000	433,000,000
Net curtailment/settlement - net of deferred taxes of $0, $0, $16 and $0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss) (OCI) before reclassifications – net of deferred taxes	0	(1,000,000)	30,000,000	(1,000,000)
Deferred taxes, other comprehensive income (loss) (OCI) before reclassifications	0	0	16,000,000	0
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Accumulated other comprehensive income (loss) at June 30	$ (15,454,000,000)	$ (14,898,000,000)	$ (15,454,000,000)	$ (14,898,000,000)