Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets:
Derivative Asset	$ 1,326	$ 619
Deferred Receivables Consideration	496	446
Liabilities:
Derivative Liability	1,469	742
Fair Value, Recurring [Member]
Assets:
Inventories carried at market	5,580	4,704
Cash Equivalents, at Carrying Value	3,381	505
Available-for-sale Securities, Fair Value Disclosure	2	5
Restricted Investments, at Fair Value	765	628
Deferred Receivables Consideration	496	446
Total Assets	11,550	6,907
Liabilities:
Inventory-related payables	1,171	729
Total Liabilities	2,640	1,471
Fair Value, Recurring [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	873	478
Liabilities:
Derivative Liability	789	574
Fair Value, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	439	138
Liabilities:
Derivative Liability	624	125
Fair Value, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	14	3
Liabilities:
Derivative Liability	56	43
Fair Value, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets:
Inventories carried at market	0	0
Cash Equivalents, at Carrying Value	3,381	505
Available-for-sale Securities, Fair Value Disclosure	2	5
Restricted Investments, at Fair Value	765	628
Deferred Receivables Consideration	0	0
Total Assets	4,148	1,138
Liabilities:
Inventory-related payables	0	0
Total Liabilities	0	0
Fair Value, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	0	0
Liabilities:
Derivative Liability	0	0
Fair Value, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	0	0
Liabilities:
Derivative Liability	0	0
Fair Value, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	0	0
Liabilities:
Derivative Liability	0	0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	3,642	3,227
Cash Equivalents, at Carrying Value	0	0
Available-for-sale Securities, Fair Value Disclosure	0	0
Restricted Investments, at Fair Value	0	0
Deferred Receivables Consideration	496	446
Total Assets	5,073	4,091
Liabilities:
Inventory-related payables	1,151	702
Total Liabilities	2,311	1,245
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	482	277
Liabilities:
Derivative Liability	480	375
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	439	138
Liabilities:
Derivative Liability	624	125
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	14	3
Liabilities:
Derivative Liability	56	43
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	1,938	1,477
Cash Equivalents, at Carrying Value	0	0
Available-for-sale Securities, Fair Value Disclosure	0	0
Restricted Investments, at Fair Value	0	0
Deferred Receivables Consideration	0	0
Total Assets	2,329	1,678
Liabilities:
Inventory-related payables	20	27
Total Liabilities	329	226
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	391	201
Liabilities:
Derivative Liability	309	199
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	0	0
Liabilities:
Derivative Liability	0	0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	0	0
Liabilities:
Derivative Liability	$ 0	$ 0