Financial Instruments Energy Narrative (Details) bbl in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($) bbl	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) bbl	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) bbl	Jul. 02, 2012	Jun. 30, 2011
Interest rate swap contracts
Derivatives, Fair Value [Line Items]
Notional value of interest rate swap agreements		$ 16,000		$ 16,000		$ 16,000
Notional Exposure of Derivatives, Short Position, less than three months		74		74		74
Short Notional Exposure	[1]	137		137		137
Commodity contracts
Derivatives, Fair Value [Line Items]
Short Notional Exposure		$ 216		$ 216		$ 234
Swap [Member] | Energy Segment [Member] | Commodity contracts | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Barrels of crack spreads hedging margin on future gasoline and distillate production | bbl		8.1		8.1		9.1
Swap [Member] | Energy Segment [Member] | Commodity contracts | Not Designated as Hedging Instrument [Member] | Accrued expenses and other liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		$ 20		$ 20		$ 47
Other income (loss), net [Member] | Swap [Member] | Energy Segment [Member] | Commodity contracts | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Realized gain (loss) on commodity derivatives		(12)	$ 36	(63)	$ 146
Cash Flow Hedging [Member] | Energy Segment [Member] | Interest rate swap contracts | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional value of interest rate swap agreements		$ 63		$ 63
Lower fixed interest rate paid on interest rate swaps							1.975%	1.94%
Frequency of interest rate swap settlements				90 days
Average fixed interest rate paid on interest rate swaps		1.96%		1.96%
Realized loss on interest rate swaps reclassified from AOCI into interest expense		$ (1)	$ (1)	$ (1)	$ (1)
Debt Facility [Member] | Term Loan [Member] | Energy Segment [Member]
Derivatives, Fair Value [Line Items]
Balance of debt partially hedged		$ 125		$ 125
Effective interest rate on debt hedged		4.60%		4.60%

[1] The short notional amount on certain of our interest rate contracts with a three month duration is approximately $16.0 billion as of both June 30, 2015 and December 31, 2014. We assume that interest rates will not fall below zero and therefore our downside short notional exposure to loss on these contracts is $74 million (of the total $137 million disclosed in the above table) as of both June 30, 2015 and December 31, 2014.