Debt Obligations - (Narrative) (Details) - USD ($) $ in Millions	Sep. 09, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	$ 2,300
Commercial Paper	5,100
Line of Credit Facility, Outstanding Borrowings	0
Multi Tranche Notes Due 2023-2026 | Defeasance of Long Term Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	94
Debt Instrument, Repurchase Amount	102
Five Year Unsecured Revolving Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	4,200	$ 3,800
Line of Credit Swing Line Subfacility	750
Line of Credit Facility, Maximum Borrowing Capacity	4,950
364 Day Unsecured Revolving Credit Agreement Member
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	4,200	$ 3,800
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,950