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Fair Value (Level 3 Reconciliation) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period $ 16 $ (221) $ (341) $ (93)
Total gains (losses) (realized and unrealized):        
Included in earnings 26 17 38 23
Included in other comprehensive income - derivative activity 7 (29) 84 (22)
Included in other comprehensive income - foreign currency translation activity (7) (2) (15) (4)
Included in regulatory (assets) liabilities (4) 2 5 9
Settlements 8 6 70 20
Transfers of assets (liabilities) into Level 3 (84) 2 0 (159)
Transfers of (assets) liabilities out of Level 3 30   151 1
Balance at end of period (8) (225) (8) (225)
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period 26 16 40 22
Interest Rate [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period (63) (281) (412) (128)
Total gains (losses) (realized and unrealized):        
Included in earnings (1) (1) (2) (1)
Included in other comprehensive income - derivative activity 7 (29) 84 (30)
Included in other comprehensive income - foreign currency translation activity (1) 0 (3) 0
Included in regulatory (assets) liabilities 0 0 0 0
Settlements 9 12 73 19
Transfers of assets (liabilities) into Level 3 (84) 2 0 (159)
Transfers of (assets) liabilities out of Level 3 30   157 2
Balance at end of period (103) (297) (103) (297)
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period 0 (1) 0 (1)
Cross Currency [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period       (18)
Total gains (losses) (realized and unrealized):        
Included in earnings       0
Included in other comprehensive income - derivative activity       8
Included in other comprehensive income - foreign currency translation activity       0
Included in regulatory (assets) liabilities       0
Settlements       11
Transfers of assets (liabilities) into Level 3       0
Transfers of (assets) liabilities out of Level 3       (1)
Balance at end of period   0   0
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period       0
Foreign currency derivatives [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 70 47 72 51
Total gains (losses) (realized and unrealized):        
Included in earnings 28 16 40 16
Included in other comprehensive income - derivative activity 0 0 0 0
Included in other comprehensive income - foreign currency translation activity (6) (2) (12) (4)
Included in regulatory (assets) liabilities 0 0 0 0
Settlements (1) (1) (3) (3)
Transfers of assets (liabilities) into Level 3 0 0 0 0
Transfers of (assets) liabilities out of Level 3 0   (6) 0
Balance at end of period 91 60 91 60
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period 27 15 40 14
Commodity [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 9 13 (1) 2
Total gains (losses) (realized and unrealized):        
Included in earnings (1) 2 0 8
Included in other comprehensive income - derivative activity 0 0 0 0
Included in other comprehensive income - foreign currency translation activity 0 0 0 0
Included in regulatory (assets) liabilities (4) 2 5 9
Settlements 0 (5) 0 (7)
Transfers of assets (liabilities) into Level 3 0 0 0 0
Transfers of (assets) liabilities out of Level 3 0   0 0
Balance at end of period 4 12 4 12
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period $ (1) $ 2 $ 0 $ 9