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Equity Method Investments And Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) £ in Millions, $ in Millions | Dec. 31, 2015 USD ($) | Dec. 31, 2015 GBP (£) | Dec. 31, 2014 USD ($)
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Schedule of Equity Method Investments [Line Items] |  |  |
Nonrecourse project debt | $ 51 |  | $ 63
Variable Interest Entity, Not Primary Beneficiary [Member] | U.K. Road Projects [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Unconsolidated VIEs, Total assets | 34 |  | 34
Unconsolidated VIEs, Total liabilities | 11 |  | 11
Maximum exposure to loss | 34 |  | 34
Variable Interest Entity, Not Primary Beneficiary [Member] | Aspire Defence Project [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Unconsolidated VIEs, Total assets | 17 |  | 17
Unconsolidated VIEs, Total liabilities | 121 |  | 118
Maximum exposure to loss | 17 |  | 17
Variable Interest Entity, Not Primary Beneficiary [Member] | Ichthys LNG Project [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Unconsolidated VIEs, Total assets | 87 |  | 49
Unconsolidated VIEs, Total liabilities | 63 |  | 35
Maximum exposure to loss | 87 |  | 49
Variable Interest Entity, Not Primary Beneficiary [Member] | EBIC Ammonia Plant [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Unconsolidated VIEs, Total assets | 36 |  | 42
Unconsolidated VIEs, Total liabilities | 2 |  | 2
Maximum exposure to loss | 22 |  | 26
Variable Interest Entity, Primary Beneficiary [Member] | Fasttrax Limited Project [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Consolidated VIEs, Total assets | 74 |  | 83
Consolidated VIEs, Total liabilities | 70 |  | 81
Variable Interest Entity, Primary Beneficiary [Member] | Escravos Gas-To-Liquids Project [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Consolidated VIEs, Total assets | 16 |  | 23
Consolidated VIEs, Total liabilities | 33 |  | 36
Variable Interest Entity, Primary Beneficiary [Member] | Gorgon LNG Project [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Consolidated VIEs, Total assets | 117 |  | 282
Consolidated VIEs, Total liabilities | 145 |  | $ 309
Nonrecourse Project Finance Debt [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Nonrecourse project debt | £ |  | £ 84.9 |
Non-recourse debt bridge financing | £ |  | £ 12.2 |
United States of America, Dollars | Nonrecourse Project Finance Debt [Member] | Fasttrax Limited Project [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Nonrecourse project debt | 120 |  |
Non-recourse debt bridge financing | $ 17 |  |

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