Derivatives and Hedging Activities (Details) (USD $)	Sep. 30, 2013 Positions	Dec. 31, 2012
Stage 1 thresholds for Systemically Important Financial Institution designation process
Minimum value of assets to be held under Stage 1 metrics	$ 50,000,000,000
Minimum number of thresholds to be met in Stage 1	1
Number of thresholds used as criteria in Stage 1	5
Minimum value of derivative liabilities under Stage 1 metrics	3,500,000,000
Company's derivative liabilities by the rule of interpretive guidance for SIFI
Fair value of derivative liabilities	3,828,000,000	4,198,000,000
Derivatives not designated as hedging instruments
Company's derivative liabilities by the rule of interpretive guidance for SIFI
Fair value of derivative liabilities	$ 3,828,000,000	$ 4,198,000,000