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Retrospective Responsibility Plan Changes in the Escrow Account (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 6 Months Ended 12 Months Ended
Jan. 27, 2014
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Escrow Account [Roll Forward]        
Litigation Escrow Account Balance, Beginning of Period   $ 49 $ 4,432 $ 4,432
Return of takedown payments to the litigation escrow account   1,056 0  
Litigation Escrow Account Balance, End of Period   1,105 49  
Class plaintiffs
       
Restricted Cash and Cash Equivalents Items [Line Items]        
Adjustment to payments for litigation 1,056      
Escrow Account [Roll Forward]        
Payments to Settlement Funds   0 (4,033) (4,033)
Individual Plaintiffs
       
Escrow Account [Roll Forward]        
Payments to Settlement Funds   $ 0 $ (350)