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