Parent Company Financial Statements (Parent Company Condensed Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and due from banks	$ 1,565	$ 1,975
Interest-bearing deposits with banks	452	942
AFS securities, fair value	22,104	25,137
HTM securities, amortized cost	18,101	13,594
Other assets	14,131	15,144
Total assets	183,010	184,499
Liabilities and Shareholders' Equity
Short-term borrowings	4,138	2,864	3,566
Accounts payable and other liabilities	7,095	8,223
Long-term debt	21,493	19,114
Total liabilities	160,201	163,276
Total shareholders' equity	22,809	21,223	17,480	16,498
Total liabilities and shareholders' equity	183,010	184,499
Parent Company [Member]
Assets
Cash and due from banks	0	4,239
Interest-bearing deposits with banks	5,727	0
AFS securities, fair value	26	27
HTM securities, amortized cost	35	37
Investment in banking subsidiaries	22,314	21,189
Investment in other subsidiaries	1,281	1,837
Advances to / receivables from banking subsidiaries	106	44
Advances to / receivables from other subsidiaries	2,308	2,408
Other assets	194	246
Total assets	31,991	30,027
Liabilities and Shareholders' Equity
Short-term borrowings	24	37
Short-term borrowed funds due to subsidiaries	50	0
Dividends payable	0	170
Accounts payable and other liabilities	76	30
Long-term debt	9,032	8,567
Total liabilities	9,182	8,804
Total shareholders' equity	22,809	21,223
Total liabilities and shareholders' equity	$ 31,991	$ 30,027