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Financial Instruments Energy Narrative (Details) bbl in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) bbl | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) bbl | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) bbl | Jul. 02, 2012 | Jun. 30, 2011
Investment Segment [Member] | Interest rate swap contracts |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Notional value of interest rate swap agreements | $ 16,000 |  | $ 16,000 |  | $ 16,000 |  |
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 | 29 |  | 29 |  | $ 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 | (3) | $ 26 | 60 | $ 171 |  |  |
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) |  |  |
Gasoline and distillation production [Member] | 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 | 3.1 |  | 3.1 |  | 9.1 |  |
Crude oil purchases [Member] | 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 | 1.5 |  | 1.5 |  |  |  |
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% |  |  |  |

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