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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Assets measured at fair value on a recurring basis

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March 31, 2020

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December 31, 2019

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Level 1

    

Level 2

    

Level 3

    

Total

    

Level 1

    

Level 2

    

Level 3

    

Total

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(in millions)

Assets

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Investments (Note 4)

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$

7,748

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$

235

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$

3

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$

7,986

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$

9,448

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$

281

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$

3

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$

9,732

Derivative contracts, at fair value (Note 6)

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—

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2,866

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—

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2,866

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—

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182

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—

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182

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$

7,748

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$

3,101

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$

3

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$

10,852

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$

9,448

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$

463

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$

3

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$

9,914

Liabilities

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Securities sold, not yet purchased (Note 4)

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$

459

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$

—

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$

—

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$

459

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$

1,190

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$

—

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$

—

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$

1,190

Derivative contracts, at fair value (Note 6)

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—

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81

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—

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81

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—

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1,224

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—

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1,224

Other liabilities

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—

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6

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6

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12

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—

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7

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6

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13

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$

459

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$

87

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$

6

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$

552

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$

1,190

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$

1,231

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$

6

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$

2,427

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Assets measured at fair value on a recurring basis for which we use Level 3 inputs to determine fair value

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Three Months Ended March 31, 

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2020

    

2019

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(in millions)

Balance at January 1

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$

3

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$

372

Net gains recognized in income

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—

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89

Sales

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—

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(458)

Balance at March 31

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$

3

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$

3