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Non-Derivative Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets, carrying amount | $ 91,803 | $ 82,010 | $ 70,334
Impairment of long-lived assets |  | 72 |
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 | 1,900 |  |
Fair value of long-lived assets | 400 |  |
Impairment of long-lived assets | 1,500 |  |
Impairment of long-lived assets, after tax | $ 1,200 |  |

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