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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Related Party Transactions On Statement Of Operations [Abstract] |  |  |
Revenue - Non-Regulated | $ 8,216 | $ 7,419 | $ 6,533
Revenue - Regulated | 9,925 | 9,504 | 8,910
Cost of Sale - Non-Regulated | 5,994 | 5,726 | 5,126
Interest expense | 1,572 | 1,553 | 1,449
Other income | 105 | 149 | 100
Related Party Receivables And Payables [Abstract] |  |  |
Receivables from related parties | 2,712 | 2,522 |
Payables to related parties | 2,638 | 2,008 |
Other Related Party Transactions [Abstract] |  |  |
Nature of Common Ownership or Management Control Relationships |  | Terrific Investment Corporation, also a subsidiary of China Investment Corporation, owns approximately 15% of the Company’s outstanding shares of common stock and has representation on the Company’s Board of Directors. |
Affiliated Entity [Member] |  |  |
Related Party Transactions On Statement Of Operations [Abstract] |  |  |
Revenue - Non-Regulated | 926 | 736 | 686
Revenue - Regulated | 37 | 39 | 26
Cost of Sale - Non-Regulated | 63 | 77 | 36
Interest expense | 8 | 4 | 2
Other income | 4 | 6 | 0
Related Party Receivables And Payables [Abstract] |  |  |
Receivables from related parties | 178 | 164 |
Payables to related parties | $ 7 | $ 12 |
Mong Dong [Member] |  |  |
Other Related Party Transactions [Abstract] |  |  |
Effective Ownership Sold |  | 0.00% |

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