Fair Value Measurements (Reconciliation Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 3,042	$ 1,678
Total increase (decrease) in unrealized gains included in cost of products sold	2,202	1,084
Purchases	30,357	14,185
Sales	(30,471)	(13,852)
Settlements	(1,437)	(257)
Transfers into Level 3	1,303	360
Transfers out of Level 3	(1,532)	(156)
Balance at end of period	3,464	3,042
Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	2,183	1,477
Total increase (decrease) in unrealized gains included in cost of products sold	1,131	146
Purchases	30,357	14,185
Sales	(30,471)	(13,852)
Transfers into Level 3	1,200	290
Transfers out of Level 3	(1,396)	(63)
Balance at end of period	3,004	2,183
Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	859	201
Total increase (decrease) in unrealized gains included in cost of products sold	1,071	938
Settlements	(1,437)	(257)
Transfers into Level 3	103	70
Transfers out of Level 3	(136)	(93)
Balance at end of period	$ 460	$ 859