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Schedule I (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash Dividends Paid to Parent, Consolidated Subsidiaries | $ 8,300 | $ 5,600 |
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash Dividends Paid to Parent, Consolidated Subsidiaries | 10,000 | 5,600 | $ 5,600
Return of capital to parent company | 943 | 4,497 | $ 4,196
Notes Payable | 4,900 |  |
Subsidiaries [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Other Long-term Debt | $ 1,200 | $ 1,200 |

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