Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 936	$ 963
Total increase (decrease) in unrealized gains included in cost of products sold	2,477	1,975
Purchases	183	123
Sales	(203)	(30)
Settlements	(2,844)	(2,191)
Transfers into Level 3	401	324
Transfers out of Level 3	(252)	(228)
Balance at end of period	$ 698	$ 936
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	$ 815	$ 918
Total increase (decrease) in unrealized gains included in cost of products sold	2,483	1,992
Purchases	0	0
Sales	0	0
Settlements	(2,844)	(2,191)
Transfers into Level 3	401	324
Transfers out of Level 3	(252)	(228)
Balance at end of period	603	815
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	106	11
Total increase (decrease) in unrealized gains included in cost of products sold	3	2
Purchases	183	123
Sales	(203)	(30)
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at end of period	89	106
Long-term Debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	15	34
Total increase (decrease) in unrealized gains included in cost of products sold		19
Purchases		0
Sales	0
Settlements	0
Transfers into Level 3	0
Transfers out of Level 3	0
Balance at end of period	6	$ 15
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	$ 9