Financial Instruments Energy (Details) bbl in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($) bbl	Dec. 31, 2014 USD ($) bbl	Dec. 31, 2013 USD ($)	Jul. 01, 2011	Jun. 30, 2011
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Gross	[1]	$ 430	$ 60
Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Gross	[2]	204	637
Equity contracts | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Gross	[1]	339	0
Equity contracts | Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Gross	[2]	122	552
Foreign exchange contracts | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Gross	[1]	0	11
Foreign exchange contracts | Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Gross	[2]	19	0
Credit contracts | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Gross	[1]	45	1
Credit contracts | Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Gross	[2]	53	85
Interest rate contracts | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Gross	[1]	0	1
Interest rate contracts | Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Gross	[2]	0	0
Commodity contracts | Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of open commodity positions, net liability	[2]	10	$ 0
Interest rate contracts(2)
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		$ 16,000
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		2.5	9.1
Other Income (Loss) [Member] | Swap [Member] | Energy Segment [Member] | Commodity contracts | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of open commodity positions, net liability		$ 45	$ 47
Realized loss on commodity derivatives		(36)	$ 187	$ 60
Cash Flow Hedging [Member] | Energy Segment [Member] | Interest rate contracts(2) | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		$ 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%
Realized loss on interest rate swaps reclassified from AOCI into interest expense		$ 1
Debt Facility [Member] | Term Loan [Member] | Energy Segment [Member]
Derivatives, Fair Value [Line Items]
Balance of debt partially hedged		$ 125

[1] Net asset derivatives are located within other assets in our consolidated balance sheets.

[2] Net liability derivatives are located within accrued expenses and other liabilities in our consolidated balance sheets.