Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period	5.10%
Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period	7.50%
364 Day $6.0 Billion Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit, Credit Facility, Maximum Borrowing Capacity	$ 6,000
Line of Credit Facility, Expiration Period	364 days
Three Year $6.0 Billion Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit, Credit Facility, Maximum Borrowing Capacity	$ 6,000
Line of Credit Facility, Expiration Period	3 years
Five Year $6.0 Billion Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit, Credit Facility, Maximum Borrowing Capacity	$ 6,000
Line of Credit Facility, Expiration Period	5 years
Subsidiaries [Member]
Debt Instrument [Line Items]
Other Long-term Debt	$ 900	$ 1,400
Other Long-term Debt, Current	$ 192	$ 611