Fair Value Measurements (Reconciliation Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 3,464	$ 3,042
Total increase (decrease) in unrealized gains included in cost of products sold	2,515	2,202
Purchases	49,735	30,357
Sales	(50,414)	(30,471)
Settlements	(1,672)	(1,437)
Transfers into Level 3	1,488	1,303
Transfers out of Level 3	(1,815)	(1,532)
Balance at end of period	$ 3,301	$ 3,464
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of products sold	Cost of products sold
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of products sold	Cost of products sold
Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 3,004	$ 2,183
Total increase (decrease) in unrealized gains included in cost of products sold	867	1,131
Purchases	49,735	30,357
Sales	(50,414)	(30,471)
Transfers into Level 3	1,088	1,200
Transfers out of Level 3	(1,520)	(1,396)
Balance at end of period	2,760	3,004
Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	460	859
Total increase (decrease) in unrealized gains included in cost of products sold	1,648	1,071
Settlements	(1,672)	(1,437)
Transfers into Level 3	400	103
Transfers out of Level 3	(295)	(136)
Balance at end of period	$ 541	$ 460