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Derivative Instruments and Hedging Activities (Other Disclosures) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Net Investment Hedges
Dec. 31, 2012
Net Investment Hedges
Dec. 31, 2012
Baa1 Moody's/BBB+ S&P
Dec. 31, 2012
Baa2 Moody's/BBB+ S&P
Derivative [Line Items]              
Discussion of interest rate fair value hedge effectiveness assessment and measurement A hedging relationship is deemed effective if the fair values of the hedging instrument (derivative) and the hedged item (debt liability) change inversely within a range of 80% to 125%.            
Hedging Relationship Deemed Effective Range Lower Limit 80.00%            
Hedging Relationship Deemed Effective Range Upper Limit 125.00%            
Embedded derivatives, net fair value $ 53 $ 53          
Embedded derivatives, notional amount 2,178 3,312          
Recognized gains (losses) related to changes in the fair value of bifurcated embedded derivatives 12 (21) 76        
Amount of payables associated with cash collateral received that was netted against derivative assets 69,248 77,938          
Amount of receivables in respect of cash collateral paid that was netted against derivative liabilities 43,009 44,936          
Cash collateral receivables 158 268          
Cash collateral payables 34 9          
Net Investment Hedges              
Out-of-period pre-tax gain related to the reversal of amounts recorded in accumulated other comprehensive income due to the incorrect application of hedge accounting       300 109    
Credit Risk Related Contingencies              
Aggregate fair value of derivative contracts that contain credit-risk-related contingent features that are in a net liability position 31,096            
Posted collateral 28,008            
Amount of additional collateral or termination payments that could be called by counterparties under the terms of such agreements in the event of a downgrade of the Company's long-term credit rating           288 1,978
Amount of additional collateral or termination payments that could be called by counterparties under the terms of such agreements in the event of a downgrade of the Company's long-term credit rating, related to bilateral arrangements between the Company and other parties $ 1,926