v3.4.0.3
Fair Value Disclosures (Assets Measured at Fair Value on a Nonrecurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Assets      
Loans $ 75,566   $ 72,559
Intangible assets 2,909   2,984
Other assets 51,058   51,087
Liabilities      
Other liabilities and accrued expenses 13,304   18,711
Liabilities 730,322   711,281
Fair Value      
Other assets - Other investments 77,645   71,947
Intangible assets 4   $ 5
Nonrecurring      
Assets      
Loans 6,515 $ 3,346  
Other assets - Other investments 27 35  
Other assets - Premises, equipment and software costs 0 0  
Total carrying value 6,542 3,381  
Liabilities      
Other liabilities and accrued expenses 459 245  
Liabilities 459 245  
Nonrecurring | Loans      
Fair Value      
Gains (losses) in fair value adjustment (80) (24)  
Nonrecurring | Other Investments      
Fair Value      
Gains (losses) in fair value adjustment (3) (2)  
Nonrecurring | Premises, Equipment and Software Costs      
Fair Value      
Gains (losses) in fair value adjustment (5) (19)  
Nonrecurring | Assets Total      
Fair Value      
Gains (losses) in fair value adjustment (88) (45)  
Nonrecurring | Other liabilities and accrued expenses      
Fair Value      
Gains (losses) in fair value adjustment (20) (7)  
Nonrecurring | Liabilities Total      
Fair Value      
Gains (losses) in fair value adjustment (20) (7)  
Nonrecurring | Level 1      
Fair Value      
Loans 0 0  
Other assets - Other investments 0 0  
Other assets - Premises, equipment and software costs 0 0  
Total assets 0 0  
Other Liabilities and accrued expenses 0 0  
Total liabilities 0 0  
Nonrecurring | Level 2      
Fair Value      
Loans 3,359 2,521  
Other assets - Other investments 0 0  
Other assets - Premises, equipment and software costs 0 0  
Total assets 3,359 2,521  
Other Liabilities and accrued expenses 379 203  
Total liabilities 379 203  
Nonrecurring | Level 3      
Fair Value      
Loans 3,156 825  
Other assets - Other investments 27 35  
Other assets - Premises, equipment and software costs 0 0  
Total assets 3,183 860  
Other Liabilities and accrued expenses 80 42  
Total liabilities $ 80 $ 42