Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Available-for-sale Securities, Fair Value Disclosure	$ 905	$ 941
Fair Value, Measurements, Recurring [Member]
Assets:
Inventories carried at market	4,533	6,059
Cash Equivalents, at Carrying Value	970	2,518
Available-for-sale Securities, Fair Value Disclosure	900	907
Restricted Investments, at Fair Value	1,942	1,707
Deferred receivables consideration	216	757
Total Assets	9,437	12,917
Liabilities:
Inventory-related payables	270	742
Total Liabilities	1,048	1,566
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	742	850
Derivative Liability	658	649
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	116	118
Derivative Liability	120	166
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	18	1
Derivative Liability		9
Fair Value, Measurements, 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	970	2,518
Available-for-sale Securities, Fair Value Disclosure	819	881
Restricted Investments, at Fair Value	1,942	1,707
Deferred receivables consideration	0	0
Total Assets	3,734	5,167
Liabilities:
Inventory-related payables	0	0
Total Liabilities	0	45
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	0	31
Derivative Liability	0	45
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	3	30
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	0	0
Derivative Liability		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	3,394	4,247
Available-for-sale Securities, Fair Value Disclosure	81	26
Deferred receivables consideration	216	757
Total Assets	4,325	5,659
Liabilities:
Inventory-related payables	251	708
Total Liabilities	867	1,226
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	503	540
Derivative Liability	496	343
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	113	88
Derivative Liability	120	166
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	18	1
Derivative Liability		9
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	1,139	1,812
Available-for-sale Securities, Fair Value Disclosure	0	0
Deferred receivables consideration	0	0
Total Assets	1,378	2,091
Liabilities:
Inventory-related payables	19	34
Total Liabilities	181	295
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	239	279
Derivative Liability	162	261
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	0	0
Derivative Liability		$ 0