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Contingencies, Commitments and Guarantees (details) - Gain Contingencies (USD $)
In Millions, unless otherwise specified
 0 Months Ended 38 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended
Oct. 25, 2010
United States Fidelity & Guaranty Company v. American Re-Insurance Company, et al. [Member]
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Dec. 31, 2013
United States Fidelity & Guaranty Company v. American Re-Insurance Company, et al. [Member]
Nov. 30, 2013
United States Fidelity & Guaranty Company v. American Re-Insurance Company, et al. [Member]
item
Feb. 07, 2013
United States Fidelity & Guaranty Company v. American Re-Insurance Company, et al. [Member]
item
Nov. 11, 2013
Safeco Insurance Company of America, et al v American International Group, Inc, et al [Member]
Jun. 26, 2013
Safeco Insurance Company of America, et al v American International Group, Inc, et al [Member]
Nov. 30, 2013
Safeco Insurance Company of America, et al v American International Group, Inc, et al [Member]
Dec. 31, 2013
Safeco Insurance Company of America, et al v American International Group, Inc, et al [Member]
Mar. 27, 2012
Safeco Insurance Company of America, et al v American International Group, Inc, et al [Member]
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Jul. 26, 2011
Safeco Insurance Company of America, et al v American International Group, Inc, et al [Member]
Gain Contingencies                    
Number of other reinsurers beside American Re against which judgment was entered in a reinsurance dispute 3                  
Total settlement amount $ 420 $ 466                
Interest amount included in settlement award 169 228                
Initial settlement amount 251 238                
Interest rate accruing on judgment not yet paid 9.00% 9.00%                
Number of discrete issues modified in part by the summary judgment in reinsurance dispute       2            
Number of reinsurers with whom the Company has reached a settlement agreeement     1              
Number of parties who objected to the settlement and filed notices of appeal in workers' compensation matter                 3  
Preliminary class settlement amount approved by court in workers' compensation matter, amount payable by defendants                   450
Payment received from settlement fund         2 91 93      
Percentage of Company's allocated settlement received in workers' compensation matter         2.00% 98.00%        
Amount of settlement fund payment received that was remitted to another insurer               2    
Net gain reported in other revenues in the consolidated statement of income               $ 91