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Fair Value (Level 3 Reconciliation) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period $ (341) $ (94)
Total gains (losses) (realized and unrealized):    
Included in earnings 70 25
Included in other comprehensive income - derivative activity 93 (25)
Included in other comprehensive income - foreign currency translation activity (27) (8)
Included in regulatory (assets) liabilities 2 9
Settlements 94 31
Transfers of assets (liabilities) into Level 3   (285)
Transfers of (assets) liabilities out of Level 3 105 6
Balance at end of period (4) (341)
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 64 24
Interest Rate
    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period (412) (128)
Total gains (losses) (realized and unrealized):    
Included in earnings 13 (2)
Included in other comprehensive income - derivative activity 93 (28)
Included in other comprehensive income - foreign currency translation activity (4) (1)
Included in regulatory (assets) liabilities 0 0
Settlements 100 26
Transfers of assets (liabilities) into Level 3   (285)
Transfers of (assets) liabilities out of Level 3 109 6
Balance at end of period (101) (412)
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 10 (1)
Foreign currency derivatives
    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 72 50
Total gains (losses) (realized and unrealized):    
Included in earnings 53 32
Included in other comprehensive income - derivative activity 0 0
Included in other comprehensive income - foreign currency translation activity (23) (7)
Included in regulatory (assets) liabilities 0 0
Settlements (5) (3)
Transfers of assets (liabilities) into Level 3   0
Transfers of (assets) liabilities out of Level 3 (4) 0
Balance at end of period 93 72
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 53 28
Cross Currency
    
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   3
Included in other comprehensive income - foreign currency translation activity   0
Included in regulatory (assets) liabilities   0
Settlements   15
Transfers of assets (liabilities) into Level 3   0
Transfers of (assets) liabilities out of Level 3   0
Balance at end of period   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
Commodity
    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period (1) 2
Total gains (losses) (realized and unrealized):    
Included in earnings 4 (5)
Included in other comprehensive income - derivative activity 0 0
Included in other comprehensive income - foreign currency translation activity 0 0
Included in regulatory (assets) liabilities 2 9
Settlements (1) (7)
Transfers of assets (liabilities) into Level 3   0
Transfers of (assets) liabilities out of Level 3   0
Balance at end of period 4 (1)
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 $ (3)