Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$ 649	$ 609	$ 747
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Reversal of) provision for loan losses	(45)	25	(202)
(Reversal of) provision for losses on unfunded credit commitments	16	(17)	(29)
Depreciation, amortization and accretion, net	509	518	332
Stock-based compensation - restricted stock units	21	5	8
Deferred income taxes	61	81	128
Net gains on sales of securities	(178)	(108)	(58)
Net decrease (increase) in trading account assets	357	(74)	(136)
Net decrease (increase) in other assets	(312)	357	181
Net increase (decrease) in trading account liabilities	(355)	(144)	265
Net increase (decrease) in other liabilities	363	(531)	515
Loans originated for sale	(276)	(58)	(19)
Net proceeds from sale of loans originated for sale	226	34	22
Pension and other benefits	(262)	(26)	42
Other, net	(37)	(70)	31
Total adjustments	88	(8)	1,080
Net cash provided by (used in) operating activities	737	601	1,827
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	8,340	6,845	4,556
Proceeds from paydowns and maturities of securities available for sale	3,451	7,657	5,758
Purchases of securities available for sale and held to maturity	(12,788)	(10,440)	(12,257)
Proceeds from paydowns and maturities of securities held to maturity	501	238	157
Purchases of premises and equipment	(63)	(97)	(86)
Proceeds from sales of loans	627	316	223
Net decrease (increase) in loans	(5,333)	(4,355)	(5,801)
Proceeds from FDIC loss share agreements	2	68	134
Net cash acquired from (paid for) acquisitions	(3,185)	53	(10)
Other, net	(131)	(36)	(5)
Net cash provided by (used in) investing activities	(8,579)	249	(7,331)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	5,224	4,230	4,491
Net increase (decrease) in commercial paper and other short-term borrowings	1,200	(2,670)	2,289
Common equity contribution from The Bank of Tokyo-Mitsubishi UFJ, Ltd. (BTMU)	1,200		618
Proceeds from issuance of subordinated debt due to BTMU	1,050
Proceeds from issuance of long-term debt	1,999	895	2,000
Repayment of long-term debt	(2,103)	(2,025)	(888)
Other, net	(25)	1	(2)
Change in noncontrolling interests	9	15	17
Net cash provided by (used in) financing activities	8,554	446	8,525
Net change in cash and cash equivalents	712	1,296	3,021
Cash and cash equivalents at beginning of period	5,491	4,195	1,174
Cash and cash equivalents at end of period	6,203	5,491	4,195
Cash Paid During the Period For:
Interest	396	404	354
Income taxes, net	15	207	222
Acquisitions:
Fair value of assets acquired	3,487	7,655	38
Fair value of liabilities assumed	573	6,139	15
Supplemental Schedule of Noncash Investing and Financing Activities:
Securities available for sale transferred to securities held to maturity	4,386	155
Net transfer of loans held for investment to loans held for sale	592	308	288
Transfer of loans held for investment to other real estate owned assets (OREO)	49	100	169
Carrying amount of securities held to maturity immediately prior to transfer to securities available for sale		1,112
Transfer of The Bank of Tokyo-Mitsubishi UFJ Trust Company (BTMUT) from BTMU:
Carrying amount of assets acquired			372
Carrying amount of liabilities acquired			$ 207