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
Mar. 31, 2013
Standby liquidity facilities | Debt, Local Government [Member]
  
Guarantor Obligations [Line Items]  
Expiration, Maximum Payout $ 108
Expiration, Less than 1 year 92
Expiration, 1-3 years 3
Expiration, 3-5 years 0
Expiration, Over 5 years 13
Carrying Value 0
Residual value guarantees | Power Plant Facilities [Member]
  
Guarantor Obligations [Line Items]  
Expiration, Maximum Payout 320
Expiration, Less than 1 year 320
Expiration, 1-3 years 0
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 386
Expiration, Less than 1 year 287
Expiration, 1-3 years 72
Expiration, 3-5 years 20
Expiration, Over 5 years 7
Carrying Value $ 0