Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 208	$ 545	$ 546	$ 800
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	497	513	558	698
Total increase (decrease) in unrealized losses included in cost of products sold	199	538	525	774
Purchases	2	5	3	7
Sales	(26)		(64)
Settlements	(282)	(286)	(572)	(741)
Transfers into Level 3	15	88	29	126
Transfers out of Level 3	(4)	(2)	(78)	(8)
Balance at end of period	401	856	401	856
Significant Unobservable Inputs (Level 3) [Member] | Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		1		6
Total increase (decrease) in unrealized losses included in cost of products sold		(1)		(6)
Purchases		0		0
Balance at end of period		0		0
Significant Unobservable Inputs (Level 3) [Member] | Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	62	57	101	89
Total increase (decrease) in unrealized losses included in cost of products sold	(4)	4	(7)	2
Purchases	2	5	3	7
Sales	(26)		(64)
Settlements	0	(3)	0	(34)
Transfers into Level 3	0	2	1	1
Transfers out of Level 3	0	0	0	0
Balance at end of period	34	65	34	65
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	435	455	457	603
Total increase (decrease) in unrealized losses included in cost of products sold	203	535	532	778
Purchases	0	0	0	0
Sales	0		0
Settlements	(282)	(283)	(572)	(707)
Transfers into Level 3	15	86	28	125
Transfers out of Level 3	(4)	(2)	(78)	(8)
Balance at end of period	$ 367	$ 791	$ 367	$ 791