Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets:
Derivative Asset	$ 1,798	$ 619
Deferred Receivables Consideration	272	446
Liabilities:
Derivative Liability	1,969	742
Fair Value, Recurring [Member]
Assets:
Inventories carried at market	5,664	4,704
Cash Equivalents, at Carrying Value	496	505
Available-for-sale Securities, Fair Value Disclosure	9	5
Restricted Investments, at Fair Value	1,158	628
Deferred Receivables Consideration	272	446
Total Assets	9,397	6,907
Liabilities:
Inventory-related payables	489	729
Total Liabilities	2,490	1,471
Fair Value, Recurring [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	1,474	478
Liabilities:
Derivative Liability	1,388	574
Fair Value, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	292	138
Liabilities:
Derivative Liability	547	125
Fair Value, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	32	3
Liabilities:
Derivative Liability	34	43
Fair Value, Recurring [Member] | Embedded Derivative Financial Instruments [Member]
Liabilities:
Derivative Liability	32
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	496	505
Available-for-sale Securities, Fair Value Disclosure	9	5
Restricted Investments, at Fair Value	1,158	628
Deferred Receivables Consideration	0	0
Total Assets	1,663	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] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Embedded Derivative Financial Instruments [Member]
Liabilities:
Derivative Liability	0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	3,572	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	272	446
Total Assets	5,062	4,091
Liabilities:
Inventory-related payables	482	702
Total Liabilities	1,655	1,245
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	894	277
Liabilities:
Derivative Liability	592	375
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	292	138
Liabilities:
Derivative Liability	547	125
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	32	3
Liabilities:
Derivative Liability	34	43
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Embedded Derivative Financial Instruments [Member]
Liabilities:
Derivative Liability	0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	2,092	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	2,672	1,678
Liabilities:
Inventory-related payables	7	27
Total Liabilities	835	226
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	580	201
Liabilities:
Derivative Liability	796	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
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Embedded Derivative Financial Instruments [Member]
Liabilities:
Derivative Liability	$ 32