Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 558	$ 698
Total increase (decrease) in unrealized losses included in cost of products sold	326	236
Purchases	1	2
Sales	(38)
Settlements	(290)	(455)
Transfers into Level 3	14	39
Transfers out of Level 3	(74)	(7)
Balance at end of period	497	513
Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		6
Total increase (decrease) in unrealized losses included in cost of products sold		(5)
Purchases		0
Balance at end of period		1
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	101	89
Total increase (decrease) in unrealized losses included in cost of products sold	(3)	(2)
Purchases	1	2
Sales	(38)
Settlements	0	(31)
Transfers into Level 3	1	0
Transfers out of Level 3	0	(1)
Balance at end of period	62	57
Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	457	603
Total increase (decrease) in unrealized losses included in cost of products sold	329	243
Purchases	0	0
Sales	0
Settlements	(290)	(424)
Transfers into Level 3	13	39
Transfers out of Level 3	(74)	(6)
Balance at end of period	$ 435	$ 455