Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets:
Derivative Asset	$ 2,281	$ 3,108
Liabilities:
Derivative Liability	2,182	2,584
Fair Value, Recurring [Member]
Assets:
Inventories carried at market	7,522	7,941
Cash Equivalents, at Carrying Value	332	297
Available-for-sale Securities, Fair Value Disclosure		1
Restricted Investments, at Fair Value	1,001	1,067
Total Assets	11,136	12,414
Liabilities:
Inventory-related payables	606	509
Total Liabilities	2,812	3,127
Fair Value, Recurring [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	1,868	2,764
Liabilities:
Derivative Liability	1,929	2,034
Fair Value, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	324	283
Liabilities:
Derivative Liability	252	535
Fair Value, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	89	61
Liabilities:
Derivative Liability	1	15
Fair Value, Recurring [Member] | Embedded Derivative Financial Instruments [Member]
Liabilities:
Derivative Liability	24	34
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	332	297
Available-for-sale Securities, Fair Value Disclosure		1
Restricted Investments, at Fair Value	1,001	1,067
Total Assets	1,333	1,365
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	0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	4,698	5,758
Cash Equivalents, at Carrying Value	0	0
Available-for-sale Securities, Fair Value Disclosure		0
Restricted Investments, at Fair Value	0	0
Total Assets	6,428	8,007
Liabilities:
Inventory-related payables	568	498
Total Liabilities	1,713	2,164
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	1,317	1,905
Liabilities:
Derivative Liability	892	1,116
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	324	283
Liabilities:
Derivative Liability	252	535
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	89	61
Liabilities:
Derivative Liability	1	15
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Embedded Derivative Financial Instruments [Member]
Liabilities:
Derivative Liability	0	0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	2,824	2,183
Cash Equivalents, at Carrying Value	0	0
Available-for-sale Securities, Fair Value Disclosure		0
Restricted Investments, at Fair Value	0	0
Total Assets	3,375	3,042
Liabilities:
Inventory-related payables	38	11
Total Liabilities	1,099	963
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	551	859
Liabilities:
Derivative Liability	1,037	918
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	$ 24	$ 34