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Condensed Financial Information (Parent Company) (Long-term Debt - Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 87 | $ 82 |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 1,100 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 1,700 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,200 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 539 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 51 |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 10,000 |  |
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 1,300 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 1,400 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,200 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 508 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 0 |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 10,800 |  |
Senior Notes | 13,588 | 12,814 |
Parent Company | Senior Notes Unaffiliated [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 83 | 77 |
Senior Notes | $ 13,588 | $ 12,814 |
Parent Company | Senior Notes, Affiliated [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Senior Notes |  |  | $ 250

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