Property, Plant and Equipment (Regulated and Non-Regulated Generation and Distribution PP&E) (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
---|---|---|
Property, Plant and Equipment [Line Items] | ||
Electric generation, distribution assets and other | $ 25,383 | $ 25,242 |
Accumulated depreciation | (8,505) | (8,227) |
Net electric generation and distribution assets and other | 16,878 | 17,015 |
Regulated Operation [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Electric generation, distribution assets and other | 9,246 | 8,959 |
Accumulated depreciation | (3,707) | (3,504) |
Net electric generation and distribution assets and other | 5,539 | 5,455 |
Unregulated Operation [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Electric generation, distribution assets and other | 16,137 | 16,283 |
Accumulated depreciation | (4,798) | (4,723) |
Net electric generation and distribution assets and other | $ 11,339 | $ 11,560 |