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
	Mar. 31, 2022	Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 936	$ 963
Total increase (decrease) in unrealized losses included in cost of products sold	1,389	401
Purchases	2	12
Sales	(53)	(2)
Settlements	(478)	(566)
Transfers into Level 3	161	65
Transfers out of Level 3	(18)	(139)
Balance at end of period	1,939	734
Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	15	34
Total increase (decrease) in unrealized losses included in cost of products sold	15	20
Purchases	0	0
Balance at end of period	30	54
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	106	11
Total increase (decrease) in unrealized losses included in cost of products sold	(2)	0
Purchases	2	12
Sales	(53)	(2)
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at end of period	53	21
Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	815	918
Total increase (decrease) in unrealized losses included in cost of products sold	1,376	381
Purchases	0	0
Sales	0	0
Settlements	(478)	(566)
Transfers into Level 3	161	54
Transfers out of Level 3	(18)	(139)
Balance at end of period	$ 1,856	648
Foreign Exchange Contracts [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		0
Transfers into Level 3		11
Balance at end of period		$ 11