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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 1,026	$ 1,099	$ 936	$ 963
Total increase (decrease) in unrealized losses included in cost of products sold	386	306	2,047	1,358
Purchases	167	1	176	30
Sales	(5)	(27)	(61)	(29)
Settlements	(634)	(654)	(2,363)	(1,667)
Transfers into Level 3	57	60	379	284
Transfers out of Level 3	(65)	(50)	(182)	(204)
Balance at end of period	932	735	932	735
Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	11	24	15	34
Total increase (decrease) in unrealized losses included in cost of products sold	(8)	(7)	(12)	(17)
Purchases	0	0	0	0
Balance at end of period	3	17	3	17
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	55	38	106	11
Total increase (decrease) in unrealized losses included in cost of products sold	3	3	(1)	3
Purchases	167	1	176	30
Sales	(5)	(27)	(61)	(29)
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	220	15	220	15
Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	960	1,037	815	918
Total increase (decrease) in unrealized losses included in cost of products sold	391	310	2,060	1,372
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(634)	(654)	(2,363)	(1,667)
Transfers into Level 3	57	60	379	284
Transfers out of Level 3	(65)	(50)	(182)	(204)
Balance at end of period	$ 709	$ 703	$ 709	$ 703