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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 4,787	$ 3,754	$ 3,464	$ 3,042
Total increase (decrease) in unrealized gains included in cost of products sold	103	348	1,383	1,321
Purchases	11,678	7,163	21,230	13,548
Sales	(11,993)	(7,356)	(21,308)	(13,988)
Settlements	(495)	(395)	(771)	(823)
Transfers into Level 3	515	432	865	971
Transfers out of Level 3	(470)	(571)	(738)	(696)
Balance at end of period	4,125	3,375	4,125	3,375
Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	3,959	3,070	3,004	2,183
Total increase (decrease) in unrealized gains included in cost of products sold	(216)	75	431	805
Purchases	11,678	7,163	21,230	13,548
Sales	(11,993)	(7,356)	(21,308)	(13,988)
Settlements	0	0	0	0
Transfers into Level 3	222	410	549	926
Transfers out of Level 3	(405)	(538)	(661)	(650)
Balance at end of period	3,245	2,824	3,245	2,824
Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	828	684	460	859
Total increase (decrease) in unrealized gains included in cost of products sold	319	273	952	516
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(495)	(395)	(771)	(823)
Transfers into Level 3	293	22	316	45
Transfers out of Level 3	(65)	(33)	(77)	(46)
Balance at end of period	$ 880	$ 551	$ 880	$ 551