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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 4,125	$ 3,375	$ 3,464	$ 3,042
Total increase (decrease) in unrealized gains included in cost of products sold	660	358	2,043	1,679
Purchases	13,294	7,351	34,524	20,899
Sales	(13,931)	(7,346)	(35,239)	(21,334)
Settlements	(456)	(311)	(1,227)	(1,134)
Transfers into Level 3	433	239	1,298	1,210
Transfers out of Level 3	(337)	(679)	(1,075)	(1,375)
Balance at end of period	3,788	2,987	3,788	2,987
Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	3,245	2,824	3,004	2,183
Total increase (decrease) in unrealized gains included in cost of products sold	315	70	746	875
Purchases	13,294	7,351	34,524	20,899
Sales	(13,931)	(7,346)	(35,239)	(21,334)
Settlements	0	0	0	0
Transfers into Level 3	384	205	933	1,131
Transfers out of Level 3	(221)	(602)	(882)	(1,252)
Balance at end of period	3,086	2,502	3,086	2,502
Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	880	551	460	859
Total increase (decrease) in unrealized gains included in cost of products sold	345	288	1,297	804
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(456)	(311)	(1,227)	(1,134)
Transfers into Level 3	49	34	365	79
Transfers out of Level 3	(116)	(77)	(193)	(123)
Balance at end of period	$ 702	$ 485	$ 702	$ 485