Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets:
Available-for-sale Securities, Fair Value Disclosure	$ 866	$ 941
Deferred receivables consideration	695	757
Fair Value, Measurements, Recurring [Member]
Assets:
Inventories carried at market	3,710	6,059
Cash Equivalents, at Carrying Value	1,012	2,518
Available-for-sale Securities, Fair Value Disclosure	860	907
Restricted Investments, at Fair Value	1,877	1,707
Deferred receivables consideration	695	757
Total Assets	9,685	12,917
Liabilities:
Inventory-related payables	310	742
Total Liabilities	1,625	1,566
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	1,289	850
Derivative Liability	1,065	649
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	239	118
Derivative Liability	246	166
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	3	1
Derivative Liability	4	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	1,012	2,518
Available-for-sale Securities, Fair Value Disclosure	779	881
Restricted Investments, at Fair Value	1,877	1,707
Deferred receivables consideration	0	0
Total Assets	3,669	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	1	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	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	2,188	4,247
Available-for-sale Securities, Fair Value Disclosure	81	26
Deferred receivables consideration	695	757
Total Assets	3,942	5,659
Liabilities:
Inventory-related payables	290	708
Total Liabilities	1,344	1,226
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	737	540
Derivative Liability	804	343
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	238	88
Derivative Liability	246	166
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Derivative Asset	3	1
Derivative Liability	4	9
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	1,522	1,812
Available-for-sale Securities, Fair Value Disclosure	0	0
Deferred receivables consideration	0	0
Total Assets	2,074	2,091
Liabilities:
Inventory-related payables	20	34
Total Liabilities	281	295
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Derivative Asset	552	279
Derivative Liability	261	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	$ 0