Fair Value Measurements (Reconciliation Of Liabilities 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, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 1,939	$ 734	$ 936	$ 963
Total increase (decrease) in unrealized losses included in cost of products sold	272	651	1,661	1,052
Purchases	7	17	9	29
Sales	(3)		(56)	(2)
Settlements	(1,251)	(447)	(1,729)	(1,013)
Transfers into Level 3	161	170	322	235
Transfers out of Level 3	(99)	(26)	(117)	(165)
Balance at end of period	1,026	1,099	1,026	1,099
Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	30	54	15	34
Total increase (decrease) in unrealized losses included in cost of products sold	(19)	(30)	(4)	(10)
Purchases	0	0	0	0
Balance at end of period	11	24	11	24
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	53	21	106	11
Total increase (decrease) in unrealized losses included in cost of products sold	(2)	0	(4)	0
Purchases	7	17	9	29
Sales	(3)		(56)	(2)
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	55	38	55	38
Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	1,856	648	815	918
Total increase (decrease) in unrealized losses included in cost of products sold	293	681	1,669	1,062
Purchases	0	0	0	0
Sales	0		0	0
Settlements	(1,251)	(447)	(1,729)	(1,013)
Transfers into Level 3	161	170	322	224
Transfers out of Level 3	(99)	(15)	(117)	(154)
Balance at end of period	$ 960	1,037	$ 960	1,037
Foreign Exchange Contracts [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		11		0
Transfers into Level 3		0		11
Transfers out of Level 3		(11)		(11)
Balance at end of period		$ 0		$ 0