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Condensed Parent Company Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Current assets: |  |  |
Other | $ 123 | $ 144 |
Total current assets | 887 | 876 |
Investments: |  |  |
Other | 154 | 148 |
Total investments | 485 | 468 |
Other assets | 2,002 | 1,830 |
Total assets | 17,710 | 16,701 | $ 15,426
Current liabilities: |  |  |
Commercial paper | 389 | 337 |
Other | 207 | 356 |
Total current liabilities | 1,297 | 2,054 |
Other liabilities | 374 | 299 |
Common Equity: |  |  |
Retained earnings | 2,994 | 2,766 |
Accumulated other comprehensive income (loss) | (1) | 1 |
Shares in deferred compensation trust | (11) | (10) |
Total common equity | 5,688 | 5,205 |
Total liabilities and equity | 17,710 | 16,701 |
Parent Company [Member] |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies | 32 | 27 |
Other | 5 | 6 |
Total current assets | 37 | 33 |
Investments: |  |  |
Investments in consolidated subsidiaries | 6,664 | 6,017 |
Other | 2 | 1 |
Total investments | 6,666 | 6,018 |
Other assets | 88 | 89 |
Total assets | 6,791 | 6,140 |
Current liabilities: |  |  |
Commercial paper | 132 | 169 |
Notes payable to affiliated companies | 937 | 731 |
Other | 29 | 19 |
Total current liabilities | 1,098 | 919 |
Other liabilities | 2 | 15 |
Common Equity: |  |  |
Common stock and additional paid-in capital | 2,706 | 2,448 |
Retained earnings | 2,996 | 2,766 |
Accumulated other comprehensive income (loss) | 0 | 2 |
Shares in deferred compensation trust | (11) | (10) |
Total common equity | 5,691 | 5,206 |
Total liabilities and equity | $ 6,791 | $ 6,140 |

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