FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Transfers into Level 3		$ 0
Transfers out of Level 3, assets		0
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Transfers into Level 3, liabilities		0
Trading account assets and liabilities
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	$ (4,753,000,000)	(2,229,000,000)
Net realized/unrealized gains (losses) included in principal transactions	(696,000,000)	(1,486,000,000)
Transfers into Level 3	39,000,000	110,000,000
Transfers out of Level 3	(27,000,000)	15,000,000
Purchases	125,000,000	47,000,000
Issuances	0	0
Sales	(169,000,000)	(101,000,000)
Settlements	35,000,000	38,000,000
Balance at end of period, asset (liability), net	(5,446,000,000)	(3,606,000,000)
Unrealized gains (losses) still held	(440,000,000)	(9,000,000)
Trading account assets and liabilities | Interest rate contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(663,000,000)	(495,000,000)
Net realized/unrealized gains (losses) included in principal transactions	(37,000,000)	(508,000,000)
Transfers into Level 3	(38,000,000)	165,000,000
Transfers out of Level 3	19,000,000	90,000,000
Purchases	6,000,000	5,000,000
Issuances	0	0
Sales	(113,000,000)	(3,000,000)
Settlements	53,000,000	(9,000,000)
Balance at end of period, asset (liability), net	(773,000,000)	(755,000,000)
Unrealized gains (losses) still held	(23,000,000)	(9,000,000)
Trading account assets and liabilities | Foreign exchange contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	413,000,000	620,000,000
Net realized/unrealized gains (losses) included in principal transactions	(390,000,000)	(353,000,000)
Transfers into Level 3	55,000,000	3,000,000
Transfers out of Level 3	(20,000,000)	30,000,000
Purchases	34,000,000	17,000,000
Issuances	0	0
Sales	(32,000,000)	(39,000,000)
Settlements	(12,000,000)	17,000,000
Balance at end of period, asset (liability), net	48,000,000	295,000,000
Unrealized gains (losses) still held	(341,000,000)	2,000,000
Trading account assets and liabilities | Equity contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(1,557,000,000)	(800,000,000)
Net realized/unrealized gains (losses) included in principal transactions	(2,000,000)	32,000,000
Transfers into Level 3	0	75,000,000
Transfers out of Level 3	(16,000,000)	(144,000,000)
Purchases	85,000,000	24,000,000
Issuances	0	0
Sales	(24,000,000)	(59,000,000)
Settlements	(10,000,000)	(4,000,000)
Balance at end of period, asset (liability), net	(1,524,000,000)	(876,000,000)
Unrealized gains (losses) still held	202,000,000	0
Trading account assets and liabilities | Commodity contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(1,945,000,000)	(1,861,000,000)
Net realized/unrealized gains (losses) included in principal transactions	(175,000,000)	(142,000,000)
Transfers into Level 3	46,000,000	(52,000,000)
Transfers out of Level 3	(2,000,000)	10,000,000
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	2,000,000	96,000,000
Balance at end of period, asset (liability), net	(2,074,000,000)	(1,949,000,000)
Unrealized gains (losses) still held	(170,000,000)	(1,000,000)
Trading account assets and liabilities | Credit derivatives
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(1,001,000,000)	307,000,000
Net realized/unrealized gains (losses) included in principal transactions	(92,000,000)	(515,000,000)
Transfers into Level 3	(24,000,000)	(81,000,000)
Transfers out of Level 3	(8,000,000)	29,000,000
Purchases	0	1,000,000
Issuances	0	0
Sales	0	0
Settlements	2,000,000	(62,000,000)
Balance at end of period, asset (liability), net	(1,123,000,000)	(321,000,000)
Unrealized gains (losses) still held	(108,000,000)	(1,000,000)
Interest-bearing deposits
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	293,000,000	434,000,000
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	11,000,000	(4,000,000)
Transfers into Level 3, liabilities	20,000,000	4,000,000
Transfers out of Level 3, liabilities	0	(209,000,000)
Purchases, liability	0	0
Issuance, liability	0	4,000,000
Sales, liability	0	0
Settlements, liability	0	(46,000,000)
Balance at end of period, liability	302,000,000	191,000,000
Unrealized gains (losses) still held, liabilities	25,000,000	0
Federal funds purchased and securities loaned or sold under agreements to repurchase
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	849,000,000	1,247,000,000
Net realized/unrealized gains (losses) included in principal transactions, liabilities	6,000,000	(25,000,000)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0
Transfers into Level 3, liabilities	0	0
Transfers out of Level 3, liabilities	0	0
Purchases, liability	0	0
Issuance, liability	0	0
Sales, liability	0	16,000,000
Settlements, liability	(34,000,000)	(50,000,000)
Balance at end of period, liability	809,000,000	1,238,000,000
Unrealized gains (losses) still held, liabilities	6,000,000	0
Trading account liabilities | Securities sold, not yet purchased
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	1,177,000,000	199,000,000
Net realized/unrealized gains (losses) included in principal transactions, liabilities	54,000,000	25,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0
Transfers into Level 3, liabilities	11,000,000	59,000,000
Transfers out of Level 3, liabilities	(14,000,000)	(25,000,000)
Purchases, liability	0	0
Issuance, liability	0	0
Sales, liability	101,000,000	36,000,000
Settlements, liability	(70,000,000)	(126,000,000)
Balance at end of period, liability	1,151,000,000	118,000,000
Unrealized gains (losses) still held, liabilities	2,000,000	(2,000,000)
Trading account liabilities | Other trading liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	1,000,000	0
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0
Transfers into Level 3, liabilities	0	0
Transfers out of Level 3, liabilities	0	0
Purchases, liability	0	0
Issuance, liability	0	0
Sales, liability	0	0
Settlements, liability	(1,000,000)	0
Balance at end of period, liability	0	0
Unrealized gains (losses) still held, liabilities	0	0
Short-term borrowings
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	42,000,000	9,000,000
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(9,000,000)	(3,000,000)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0
Transfers into Level 3, liabilities	0	5,000,000
Transfers out of Level 3, liabilities	0	(4,000,000)
Purchases, liability	0	0
Issuance, liability	11,000,000	34,000,000
Sales, liability	0	0
Settlements, liability	(2,000,000)	(1,000,000)
Balance at end of period, liability	60,000,000	46,000,000
Unrealized gains (losses) still held, liabilities	22,000,000	(4,000,000)
Long-term debt
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Transfers out of Level 3, assets		(1,100,000,000)
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	9,744,000,000	6,951,000,000
Net realized/unrealized gains (losses) included in principal transactions, liabilities	17,000,000	46,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0
Transfers into Level 3, liabilities	200,000,000	509,000,000
Transfers out of Level 3, liabilities	(409,000,000)	(1,087,000,000)
Purchases, liability	0	0
Issuance, liability	929,000,000	1,440,000,000
Sales, liability	0	0
Settlements, liability	(271,000,000)	(89,000,000)
Balance at end of period, liability	10,176,000,000	7,678,000,000
Unrealized gains (losses) still held, liabilities	116,000,000	0
Other financial liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	8,000,000	14,000,000
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	(2,000,000)	(8,000,000)
Transfers into Level 3, liabilities	0	0
Transfers out of Level 3, liabilities	0	(4,000,000)
Purchases, liability	(1,000,000)	(4,000,000)
Issuance, liability	1,000,000	1,000,000
Sales, liability	0	0
Settlements, liability	(6,000,000)	(1,000,000)
Balance at end of period, liability	4,000,000	14,000,000
Unrealized gains (losses) still held, liabilities	(2,000,000)	(5,000,000)
Federal funds sold and securities borrowed or purchased under agreements to resell
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,496,000,000	1,337,000,000
Net realized/unrealized gains (losses) included in principal transactions	(56,000,000)	70,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	0	0
Transfers out of Level 3, assets	(252,000,000)	0
Purchases, assets	0	503,000,000
Issuance, assets	0	0
Sales, assets	0	0
Settlements, assets	(1,000,000)	(1,000,000)
Balance at end of period, asset	1,187,000,000	1,909,000,000
Unrealized gains (losses) still held, assets	4,000,000	0
Trading non-derivative assets
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	6,251,000,000	12,418,000,000
Net realized/unrealized gains (losses) included in principal transactions	277,000,000	145,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	423,000,000	1,545,000,000
Transfers out of Level 3, assets	(730,000,000)	(1,130,000,000)
Purchases, assets	1,329,000,000	1,979,000,000
Issuance, assets	1,000,000	11,000,000
Sales, assets	(1,988,000,000)	(2,098,000,000)
Settlements, assets	(26,000,000)	(7,000,000)
Balance at end of period, asset	5,537,000,000	12,863,000,000
Unrealized gains (losses) still held, assets	54,000,000	(2,000,000)
Trading non-derivative assets | U.S. government-sponsored agency guaranteed
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	176,000,000	744,000,000
Net realized/unrealized gains (losses) included in principal transactions	5,000,000	12,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	50,000,000	335,000,000
Transfers out of Level 3, assets	(17,000,000)	(220,000,000)
Purchases, assets	161,000,000	356,000,000
Issuance, assets	0	0
Sales, assets	(104,000,000)	(191,000,000)
Settlements, assets	0	3,000,000
Balance at end of period, asset	271,000,000	1,039,000,000
Unrealized gains (losses) still held, assets	0	1,000,000
Trading non-derivative assets | Mortgage-backed securities - Residential
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	399,000,000	1,326,000,000
Net realized/unrealized gains (losses) included in principal transactions	15,000,000	49,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	17,000,000	104,000,000
Transfers out of Level 3, assets	(29,000,000)	(43,000,000)
Purchases, assets	50,000,000	211,000,000
Issuance, assets	0	0
Sales, assets	(84,000,000)	(455,000,000)
Settlements, assets	0	0
Balance at end of period, asset	368,000,000	1,192,000,000
Unrealized gains (losses) still held, assets	10,000,000	0
Trading non-derivative assets | Mortgage-backed securities - Commercial
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	206,000,000	517,000,000
Net realized/unrealized gains (losses) included in principal transactions	(8,000,000)	9,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	17,000,000	56,000,000
Transfers out of Level 3, assets	(13,000,000)	(27,000,000)
Purchases, assets	190,000,000	245,000,000
Issuance, assets	0	0
Sales, assets	(126,000,000)	(219,000,000)
Settlements, assets	0	0
Balance at end of period, asset	266,000,000	581,000,000
Unrealized gains (losses) still held, assets	(4,000,000)	0
Trading non-derivative assets | Mortgage-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	781,000,000	2,587,000,000
Net realized/unrealized gains (losses) included in principal transactions	12,000,000	70,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	84,000,000	495,000,000
Transfers out of Level 3, assets	(59,000,000)	(290,000,000)
Purchases, assets	401,000,000	812,000,000
Issuance, assets	0	0
Sales, assets	(314,000,000)	(865,000,000)
Settlements, assets	0	3,000,000
Balance at end of period, asset	905,000,000	2,812,000,000
Unrealized gains (losses) still held, assets	6,000,000	1,000,000
Trading non-derivative assets | U.S. Treasury and federal agency securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,000,000	1,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	0	2,000,000
Transfers out of Level 3, assets	0	0
Purchases, assets	0	0
Issuance, assets	0	0
Sales, assets	0	0
Settlements, assets	0	0
Balance at end of period, asset	1,000,000	3,000,000
Unrealized gains (losses) still held, assets	0	0
Trading non-derivative assets | State and municipal securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	296,000,000	351,000,000
Net realized/unrealized gains (losses) included in principal transactions	2,000,000	7,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	2,000,000	13,000,000
Transfers out of Level 3, assets	(47,000,000)	(159,000,000)
Purchases, assets	81,000,000	103,000,000
Issuance, assets	0	0
Sales, assets	(64,000,000)	(106,000,000)
Settlements, assets	0	0
Balance at end of period, asset	270,000,000	209,000,000
Unrealized gains (losses) still held, assets	2,000,000	0
Trading non-derivative assets | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	40,000,000	197,000,000
Net realized/unrealized gains (losses) included in principal transactions	4,000,000	(1,000,000)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	78,000,000	2,000,000
Transfers out of Level 3, assets	(13,000,000)	(4,000,000)
Purchases, assets	44,000,000	41,000,000
Issuance, assets	0	0
Sales, assets	(27,000,000)	(16,000,000)
Settlements, assets	0	0
Balance at end of period, asset	126,000,000	219,000,000
Unrealized gains (losses) still held, assets	6,000,000	0
Trading non-derivative assets | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	324,000,000	376,000,000
Net realized/unrealized gains (losses) included in principal transactions	91,000,000	12,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	27,000,000	45,000,000
Transfers out of Level 3, assets	(52,000,000)	(16,000,000)
Purchases, assets	118,000,000	169,000,000
Issuance, assets	0	0
Sales, assets	(197,000,000)	(109,000,000)
Settlements, assets	(15,000,000)	0
Balance at end of period, asset	296,000,000	477,000,000
Unrealized gains (losses) still held, assets	12,000,000	2,000,000
Trading non-derivative assets | Equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	127,000,000	3,684,000,000
Net realized/unrealized gains (losses) included in principal transactions	15,000,000	(44,000,000)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	2,000,000	93,000,000
Transfers out of Level 3, assets	(12,000,000)	(34,000,000)
Purchases, assets	7,000,000	79,000,000
Issuance, assets	0	0
Sales, assets	(29,000,000)	(23,000,000)
Settlements, assets	0	0
Balance at end of period, asset	110,000,000	3,755,000,000
Unrealized gains (losses) still held, assets	2,000,000	0
Trading non-derivative assets | Asset-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,868,000,000	2,739,000,000
Net realized/unrealized gains (losses) included in principal transactions	160,000,000	128,000,000
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	20,000,000	117,000,000
Transfers out of Level 3, assets	(16,000,000)	(14,000,000)
Purchases, assets	391,000,000	492,000,000
Issuance, assets	0	0
Sales, assets	(482,000,000)	(648,000,000)
Settlements, assets	0	0
Balance at end of period, asset	1,941,000,000	2,814,000,000
Unrealized gains (losses) still held, assets	81,000,000	0
Trading non-derivative assets | Other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	2,814,000,000	2,483,000,000
Net realized/unrealized gains (losses) included in principal transactions	(7,000,000)	(27,000,000)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	210,000,000	778,000,000
Transfers out of Level 3, assets	(531,000,000)	(613,000,000)
Purchases, assets	287,000,000	283,000,000
Issuance, assets	1,000,000	11,000,000
Sales, assets	(875,000,000)	(331,000,000)
Settlements, assets	(11,000,000)	(10,000,000)
Balance at end of period, asset	1,888,000,000	2,574,000,000
Unrealized gains (losses) still held, assets	(55,000,000)	(5,000,000)
Investments
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	3,861,000,000	5,059,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(66,000,000)	(7,000,000)
Transfers into Level 3	116,000,000	349,000,000
Transfers out of Level 3, assets	(148,000,000)	(488,000,000)
Purchases, assets	340,000,000	397,000,000
Issuance, assets	0	0
Sales, assets	(347,000,000)	(411,000,000)
Settlements, assets	(90,000,000)	(19,000,000)
Balance at end of period, asset	3,666,000,000	4,880,000,000
Unrealized gains (losses) still held, assets	12,000,000	0
Investments | U.S. government-sponsored agency guaranteed
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	101,000,000	139,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	2,000,000	(31,000,000)
Transfers into Level 3	1,000,000	7,000,000
Transfers out of Level 3, assets	(49,000,000)	(39,000,000)
Purchases, assets	0	39,000,000
Issuance, assets	0	0
Sales, assets	0	(3,000,000)
Settlements, assets	0	(1,000,000)
Balance at end of period, asset	55,000,000	111,000,000
Unrealized gains (losses) still held, assets	2,000,000	0
Investments | Mortgage-backed securities - Residential
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	50,000,000	4,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	2,000,000	1,000,000
Transfers into Level 3	0	0
Transfers out of Level 3, assets	(47,000,000)	0
Purchases, assets	0	0
Issuance, assets	0	0
Sales, assets	(5,000,000)	(5,000,000)
Settlements, assets	0	0
Balance at end of period, asset	0	0
Unrealized gains (losses) still held, assets	0	0
Investments | Mortgage-backed securities - Commercial
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	2,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	0	3,000,000
Transfers out of Level 3, assets	0	(2,000,000)
Purchases, assets	8,000,000	0
Issuance, assets	0	0
Sales, assets	(8,000,000)	0
Settlements, assets	0	0
Balance at end of period, asset	0	3,000,000
Unrealized gains (losses) still held, assets	0	0
Investments | Mortgage-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	151,000,000	145,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	4,000,000	(30,000,000)
Transfers into Level 3	1,000,000	10,000,000
Transfers out of Level 3, assets	(96,000,000)	(41,000,000)
Purchases, assets	8,000,000	39,000,000
Issuance, assets	0	0
Sales, assets	(13,000,000)	(8,000,000)
Settlements, assets	0	(1,000,000)
Balance at end of period, asset	55,000,000	114,000,000
Unrealized gains (losses) still held, assets	2,000,000	0
Investments | U.S. Treasury and federal agency securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	2,000,000	4,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	0	0
Transfers out of Level 3, assets	0	0
Purchases, assets	0	0
Issuance, assets	0	0
Sales, assets	(1,000,000)	(1,000,000)
Settlements, assets	0	0
Balance at end of period, asset	1,000,000	3,000,000
Unrealized gains (losses) still held, assets	0	0
Investments | State and municipal securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,211,000,000	2,192,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	12,000,000	35,000,000
Transfers into Level 3	37,000,000	261,000,000
Transfers out of Level 3, assets	(30,000,000)	(409,000,000)
Purchases, assets	54,000,000	151,000,000
Issuance, assets	0	0
Sales, assets	(51,000,000)	(132,000,000)
Settlements, assets	0	0
Balance at end of period, asset	1,233,000,000	2,098,000,000
Unrealized gains (losses) still held, assets	6,000,000	0
Investments | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	186,000,000	260,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	1,000,000	2,000,000
Transfers into Level 3	2,000,000	33,000,000
Transfers out of Level 3, assets	(18,000,000)	0
Purchases, assets	142,000,000	62,000,000
Issuance, assets	0	0
Sales, assets	(78,000,000)	(182,000,000)
Settlements, assets	0	0
Balance at end of period, asset	235,000,000	175,000,000
Unrealized gains (losses) still held, assets	1,000,000	0
Investments | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	311,000,000	603,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	2,000,000	14,000,000
Transfers into Level 3	59,000,000	5,000,000
Transfers out of Level 3, assets	(4,000,000)	(37,000,000)
Purchases, assets	91,000,000	1,000,000
Issuance, assets	0	0
Sales, assets	(120,000,000)	(88,000,000)
Settlements, assets	0	0
Balance at end of period, asset	339,000,000	498,000,000
Unrealized gains (losses) still held, assets	2,000,000	0
Investments | Equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	9,000,000	124,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	0	2,000,000
Transfers out of Level 3, assets	0	0
Purchases, assets	0	0
Issuance, assets	0	0
Sales, assets	0	0
Settlements, assets	0	0
Balance at end of period, asset	9,000,000	126,000,000
Unrealized gains (losses) still held, assets	0	0
Investments | Asset-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	660,000,000	596,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	9,000,000	(26,000,000)
Transfers into Level 3	17,000,000	0
Transfers out of Level 3, assets	0	(1,000,000)
Purchases, assets	26,000,000	132,000,000
Issuance, assets	0	0
Sales, assets	0	0
Settlements, assets	0	0
Balance at end of period, asset	712,000,000	701,000,000
Unrealized gains (losses) still held, assets	3,000,000	0
Investments | Other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	0
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0
Transfers into Level 3	0	0
Transfers out of Level 3, assets	0	0
Purchases, assets	11,000,000	0
Issuance, assets	0	0
Sales, assets	(11,000,000)	0
Settlements, assets	0	0
Balance at end of period, asset	0	0
Unrealized gains (losses) still held, assets	0	0
Investments | Non-marketable equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,331,000,000	1,135,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(94,000,000)	(2,000,000)
Transfers into Level 3	0	38,000,000
Transfers out of Level 3, assets	0	0
Purchases, assets	8,000,000	12,000,000
Issuance, assets	0	0
Sales, assets	(73,000,000)	0
Settlements, assets	(90,000,000)	(18,000,000)
Balance at end of period, asset	1,082,000,000	1,165,000,000
Unrealized gains (losses) still held, assets	(2,000,000)	0
Loans
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	568,000,000	2,166,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(4,000,000)	(77,000,000)
Transfers into Level 3	65,000,000	89,000,000
Transfers out of Level 3, assets	(16,000,000)	(538,000,000)
Purchases, assets	12,000,000	359,000,000
Issuance, assets	0	161,000,000
Sales, assets	(43,000,000)	(378,000,000)
Settlements, assets	(2,000,000)	(59,000,000)
Balance at end of period, asset	580,000,000	1,723,000,000
Unrealized gains (losses) still held, assets	74,000,000	7,000,000
Mortgage servicing rights
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,564,000,000	1,781,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	67,000,000	(225,000,000)
Transfers into Level 3	0	0
Transfers out of Level 3, assets	0	0
Purchases, assets	0	0
Issuance, assets	35,000,000	33,000,000
Sales, assets	(1,046,000,000)	14,000,000
Settlements, assets	(53,000,000)	(79,000,000)
Balance at end of period, asset	567,000,000	1,524,000,000
Unrealized gains (losses) still held, assets	83,000,000	57,000,000
Other financial assets measured on a recurring basis
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	34,000,000	180,000,000
Net realized/unrealized gains (losses) included in principal transactions	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(189,000,000)	17,000,000
Transfers into Level 3	3,000,000	3,000,000
Transfers out of Level 3, assets	(1,000,000)	(3,000,000)
Purchases, assets	0	0
Issuance, assets	29,000,000	63,000,000
Sales, assets	204,000,000	(120,000,000)
Settlements, assets	(53,000,000)	(83,000,000)
Balance at end of period, asset	27,000,000	57,000,000
Unrealized gains (losses) still held, assets	$ (191,000,000)	$ (317,000,000)