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Schedule I (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash Dividends Paid to Parent, Consolidated Subsidiaries | $ 8,000 | $ 8,300 |
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Cash Dividends Paid to Parent, Consolidated Subsidiaries | 10,800 | 10,000 | $ 5,600
Return of capital to parent company | 245 | 943 | $ 4,497
Notes Payable | 8,100 | 4,900 |
Subsidiaries [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Other Long-term Debt | $ 1,400 | $ 1,200 |

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