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Segment and Related Information (Geographic Data) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers | $ 1,954 | $ 1,933 | $ 1,803 | $ 2,079 | $ 1,939 | $ 1,872 | $ 1,848 | $ 2,126 | $ 7,769 | $ 7,785 | $ 7,447
Long-lived assets | 37,225 |  |  |  | 35,175 |  |  |  | 37,225 | 35,175 |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 5,602 | 5,517 | 5,356
Long-lived assets | 23,607 |  |  |  | 22,384 |  |  |  | 23,607 | 22,384 |
U.K. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 13,618 |  |  |  | $ 12,791 |  |  |  | 13,618 | 12,791 |
U.K. Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 2,167 | $ 2,268 | $ 2,091

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