Quarterly report pursuant to Section 13 or 15(d)

Commitments, Contingencies and Guarantees - Guarantees (Details)

v2.4.0.6
Commitments, Contingencies and Guarantees - Guarantees (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Standby liquidity facilities | Debt, Local Government [Member]
  
Guarantor Obligations [Line Items]  
Expiration, Maximum Payout $ 783
Expiration, Less than 1 year 764
Expiration, 1-3 years 0
Expiration, 3-5 years 3
Expiration, Over 5 years 16
Carrying Value 0
Residual value guarantees | Power Plant Facilities [Member]
  
Guarantor Obligations [Line Items]  
Expiration, Maximum Payout 320
Expiration, Less than 1 year 206
Expiration, 1-3 years 114
Expiration, 3-5 years 0
Expiration, Over 5 years 0
Carrying Value 0
Standby letters of credit and other guarantees
  
Guarantor Obligations [Line Items]  
Expiration, Maximum Payout 412
Expiration, Less than 1 year 323
Expiration, 1-3 years 62
Expiration, 3-5 years 27
Expiration, Over 5 years 0
Carrying Value $ 0