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Financial Instruments Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Dec. 31, 2017

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Derivative contracts at fair value (liability)

$ 460

$ 460

$ 1,275

Not designated as hedging instrument | Other assets

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Asset Derivatives, Gross

^[1]

32

32

7

Netting across contract types

^[1],[2]

(5)

(5)

(7)

Derivative contracts, at fair value (asset)

^[1],[2]

27

27

0

Not designated as hedging instrument | Other assets | Equity contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Asset Derivatives, Gross

^[1]

16

16

0

Not designated as hedging instrument | Other assets | Credit contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Asset Derivatives, Gross

^[1]

0

0

0

Not designated as hedging instrument | Other assets | Commodity contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Asset Derivatives, Gross

^[1]

16

16

7

Not designated as hedging instrument | Accrued expenses and other liabilities

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Liability Derivatives, Gross

465

465

1,282

Netting across contract types

^[2]

(5)

(5)

(7)

Derivative contracts at fair value (liability)

^[2]

460

460

1,275

Not designated as hedging instrument | Accrued expenses and other liabilities | Equity contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Liability Derivatives, Gross

433

433

1,159

Not designated as hedging instrument | Accrued expenses and other liabilities | Credit contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Liability Derivatives, Gross

0

0

17

Not designated as hedging instrument | Accrued expenses and other liabilities | Commodity contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Liability Derivatives, Gross

32

32

106

Investment Segment

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Collateral for derivative positions

252

252

$ 542

Net gain from investment activities | Not designated as hedging instrument

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Gain (loss) on derivatives not designated as hedging instruments recognized in income

^[3]

(128)

$ (265)

78

$ (868)

Net gain from investment activities | Not designated as hedging instrument | Equity contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Gain (loss) on derivatives not designated as hedging instruments recognized in income

^[3]

(147)

(262)

(89)

(835)

Net gain from investment activities | Not designated as hedging instrument | Credit contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Gain (loss) on derivatives not designated as hedging instruments recognized in income

^[3]

0

8

53

(17)

Net gain from investment activities | Not designated as hedging instrument | Commodity contracts

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Gain (loss) on derivatives not designated as hedging instruments recognized in income

^[3]

19

(11)

114

(16)

Net gain from investment activities | Investment Segment | Not designated as hedging instrument

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Gain (loss) on derivatives not designated as hedging instruments recognized in income

^[3]

(139)

(265)

8

(880)

Other Operating Income (Expense) [Member] | Other Segments | Not designated as hedging instrument

Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]

Gain (loss) on derivatives not designated as hedging instruments recognized in income

^[3]

$ 11

$ 0

$ 70

$ 12

[1]	Net asset derivatives are classified within other assets in our condensed consolidated balance sheets.
[2]	Excludes netting of cash collateral received and posted. The total collateral posted at June 30, 2018 and December 31, 2017 was $252 million and $542 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash on the condensed consolidated balance sheets.
[3]	Gains (losses) recognized on derivatives are classified in net gain (loss) from investment activities in our condensed consolidated statements of operations for our Investment segment and are included in other income (loss), net for all other segments. Gains (losses) recognized on derivatives for our Investment segment were $(139) million and $(265) million for the three months ended June 30, 2018 and 2017, respectively, and $8 million and $(880) million for the six months ended June 30, 2018 and 2017, respectively. Gains recognized on derivatives for our other segments were $11 million and zero for the three months ended June 30, 2018 and 2017, respectively, and $70 million and $12 million for the six months ended June 30, 2018 and 2017, respectively.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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