Fair Value Measurements (Reconciliation Of Assets Measured At Fair Value On A Recurring Basis) (Details) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 4,152	$ 4,787	$ 3,301	$ 3,464
Total increase (decrease) in unrealized gains included in cost of products sold	837	103	1,316	1,383
Purchases	9,910	11,678	18,575	21,230
Sales	(10,646)	(11,993)	(18,900)	(21,308)
Settlements	(461)	(495)	(843)	(771)
Transfers into Level 3	787	515	1,442	865
Transfers out of Level 3	(834)	(470)	(1,146)	(738)
Balance at end of period	3,745	4,125	3,745	4,125
Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	3,503	3,959	2,760	3,004
Total increase (decrease) in unrealized gains included in cost of products sold	362	(216)	364	431
Purchases	9,910	11,678	18,575	21,230
Sales	(10,646)	(11,993)	(18,900)	(21,308)
Settlements	(4)	0	(4)	0
Transfers into Level 3	547	222	1,152	549
Transfers out of Level 3	(813)	(405)	(1,088)	(661)
Balance at end of period	2,859	3,245	2,859	3,245
Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	649	828	541	460
Total increase (decrease) in unrealized gains included in cost of products sold	475	319	952	952
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(457)	(495)	(839)	(771)
Transfers into Level 3	240	293	290	316
Transfers out of Level 3	(21)	(65)	(58)	(77)
Balance at end of period	$ 886	$ 880	$ 886	$ 880