Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets:
Derivative Asset	$ 1,065	$ 619
Deferred Receivables Consideration	1,149	446
Liabilities:
Derivative Liability	1,121	742
Fair Value, Recurring [Member]
Assets:
Inventories carried at market	4,582	4,704
Cash Equivalents, at Carrying Value	498	505
Available-for-sale Securities, Fair Value Disclosure	3	5
Restricted Investments, at Fair Value	1,061	628
Deferred Receivables Consideration	1,149	446
Total Assets	8,358	6,907
Liabilities:
Inventory-related payables	643	729
Total Liabilities	1,764	1,471
Fair Value, Recurring [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	746	478
Liabilities:
Derivative Liability	684	574
Fair Value, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	309	138
Liabilities:
Derivative Liability	391	125
Fair Value, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	10	3
Liabilities:
Derivative Liability	46	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	498	505
Available-for-sale Securities, Fair Value Disclosure	3	5
Restricted Investments, at Fair Value	1,061	628
Deferred Receivables Consideration	0	0
Total Assets	1,562	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	3,183	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	1,149	446
Total Assets	4,955	4,091
Liabilities:
Inventory-related payables	629	702
Total Liabilities	1,387	1,245
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	304	277
Liabilities:
Derivative Liability	321	375
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	309	138
Liabilities:
Derivative Liability	391	125
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	10	3
Liabilities:
Derivative Liability	46	43
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	1,399	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	1,841	1,678
Liabilities:
Inventory-related payables	14	27
Total Liabilities	377	226
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	442	201
Liabilities:
Derivative Liability	363	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