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New Accounting Guidance Pending Adoption New Accounting Guidance Pending Adoption (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Pension Plan [Member] | U.K. |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Estimated Impact Of The Adoption Of ASU 2017-07 | $ 130 | $ 90

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- Definition Estimated impact of the non-service cost components of net periodic benefit costs in a credit position to be reclassified from Other Operation and Maintenance to Other Income (Expense)- net as a result of adopting ASU 2017-07. + References No definition available. + Details
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