Condensed MUFG Americas Holdings Corporation Unconsolidated Financial Statements - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 1,756	$ 1,759
Other assets	5,377	4,630
Total assets	116,206	113,623	$ 105,849
Liabilities and Stockholder's Equity
Long-term debt	12,349	6,972
Other liabilities	2,023	1,897
Total liabilities	100,546	98,471
Stockholder's equity	15,660	15,152	$ 14,414	$ 12,691
Total liabilities and stockholder's equity	116,206	113,623
MUFG Americas Holdings Corporation
Assets
Cash and cash equivalents	407	328
Investments in and advances to subsidiaries	18,023	15,341
Other assets	25	4
Total assets	18,455	15,673
Liabilities and Stockholder's Equity
Long-term debt	2,932	750
Other liabilities	44	1
Total liabilities	2,976	751
Stockholder's equity	15,479	14,922
Total liabilities and stockholder's equity	$ 18,455	$ 15,673