Consolidated Statements of Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest Income
Loans	$ 621	$ 565	$ 1,227	$ 1,124
Securities	134	138	276	281
Interest income - other		2	2	3
Total interest income	755	705	1,505	1,408
Interest Expense
Deposits	57	53	115	106
Long-term debt	36	36	72	67
Commercial paper and other short-term borrowings	3	2	6	3
Total interest expense	96	91	193	176
Net Interest Income	659	614	1,312	1,232
(Reversal of) provision for loan losses	(14)	(94)	(15)	(196)
Net interest income after (reversal of) provision for loan losses	673	708	1,327	1,428
Noninterest Income
Service charges on deposit accounts	52	50	107	102
Trust and investment management fees	27	34	57	68
Trading account activities	25	28	56	61
Securities gains, net	28	29	47	57
Merchant banking fees	19	29	42	48
Brokerage commissions and fees	11	12	21	25
Card processing fees, net	8	18	16	33
Other	5	40	31	86
Total noninterest income	175	240	377	480
Noninterest Expense
Salaries and employee benefits	351	346	715	690
Net occupancy and equipment	64	67	132	132
Professional and outside services	47	55	93	99
Intangible asset amortization	21	24	42	49
Regulatory assessments	16	19	34	40
(Reversal of) provision for losses on off-balance sheet commitments	(1)	(18)	(3)	(31)
Other	101	85	200	214
Total noninterest expense	599	578	1,213	1,193
Income before income taxes and including noncontrolling interests	249	370	491	715
Income tax expense	67	131	118	245
Net Income Including Noncontrolling Interests	182	239	373	470
Deduct: Net loss from noncontrolling interests	5	3	9	7
Net Income Attributable to UnionBanCal Corporation (UNBC)	$ 187	$ 242	$ 382	$ 477