Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 698	$ 936
Total increase (decrease) in unrealized gains included in cost of products sold	1,302	2,477
Purchases	49	183
Sales		(203)
Settlements	(1,618)	(2,844)
Transfers into Level 3	158	401
Transfers out of Level 3	(31)	(252)
Balance at end of period	$ 558	$ 698
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of products sold, Interest Expense	Cost of products sold, Interest Expense
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of products sold	Cost of products sold, Interest Expense
Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 603	$ 815
Total increase (decrease) in unrealized gains included in cost of products sold	1,303	2,483
Purchases	0	0
Sales		0
Settlements	(1,583)	(2,844)
Transfers into Level 3	157	401
Transfers out of Level 3	(23)	(252)
Balance at end of period	457	603
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	89	106
Total increase (decrease) in unrealized gains included in cost of products sold	5	3
Purchases	49	183
Sales		(203)
Settlements	(35)	0
Transfers into Level 3	1	0
Transfers out of Level 3	(8)	0
Balance at end of period	101	89
Long-term Debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	6	15
Total increase (decrease) in unrealized gains included in cost of products sold		9
Purchases		0
Settlements	0
Transfers into Level 3	0
Transfers out of Level 3	0
Balance at end of period	0	$ 6
Long-term Debt | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total increase (decrease) in unrealized gains included in cost of products sold	$ 6