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v3.19.3.a.u2

Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets, carrying amount |  | $ 82,010 | $ 70,334 |
Impairment of long-lived assets |  | 72 | $ 11 | $ 446
Impairment of long-lived assets, after tax |  | $ 54 |  |
NEER [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets, carrying amount |  |  |  | 502
Fair value of long-lived assets |  |  |  | 82
Impairment of long-lived assets |  |  |  | 420
Impairment of long-lived assets, after tax |  |  |  | $ 258
Jointly Owned Nuclear Power Plant 2 Member | NEER [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Proportionate ownership share |  | 70.00% | 70.00% |
Purchased Power Agreements [Member] | NEER [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Shortened term | 5 years |  |  |

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