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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Investment Segment [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Investment
The following table summarizes the valuation of the Investment Funds' investments and derivative contracts by the above fair value hierarchy levels as of March 31, 2013 and December 31, 2012: 
 
March 31, 2013
 
December 31, 2012
  
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
(in millions)
Investments:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Equity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
      Basic materials
$
53

 
$
9

 
$

 
$
62

 
$
144

 
$
9

 
$

 
$
153

      Communications
1,036

 
14

 

 
1,050

 
560

 
16

 

 
576

      Consumer, non-cyclical
1,894

 

 

 
1,894

 
1,340

 

 

 
1,340

      Consumer, cyclical
337

 

 

 
337

 
261

 

 

 
261

      Diversified
28

 

 

 
28

 

 

 

 

      Energy
1,921

 
19

 

 
1,940

 
1,052

 
55

 

 
1,107

      Financial
234

 

 

 
234

 
244

 

 

 
244

      Funds

 

 

 

 

 
308

 

 
308

      Technology
641

 
525

 

 
1,166

 
325

 

 

 
325

      Utilities
2

 

 

 
2

 
208

 

 

 
208

 
6,146

 
567

 

 
6,713

 
4,134

 
388

 

 
4,522

   Corporate debt:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
      Consumer, cyclical

 

 
290

 
290

 

 

 
288

 
288

      Financial

 
15

 

 
15

 

 
50

 

 
50

      Sovereign debt

 
3

 

 
3

 

 
5

 

 
5

      Utilities

 
30

 

 
30

 

 
31

 

 
31

 

 
48

 
290

 
338

 

 
86

 
288

 
374

   Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
      Financial

 
175

 

 
175

 

 
188

 

 
188

 
6,146

 
790

 
290

 
7,226

 
4,134

 
662

 
288

 
5,084

Derivative contracts, at fair value(1)

 
1

 

 
1

 

 

 

 

 
$
6,146

 
$
791

 
$
290

 
$
7,227

 
$
4,134

 
$
662

 
$
288

 
$
5,084

Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities sold, not yet purchased, at fair value:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Equity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
      Consumer, cyclical
$
620

 
$

 
$

 
$
620

 
$
473

 
$

 
$

 
$
473

      Funds

 

 

 

 

 
60

 

 
60

 
620

 

 

 
620

 
473

 
60

 

 
533

Derivative contracts, at fair value(2)

 
478

 

 
478

 

 
84

 

 
84

 
$
620

 
$
478

 
$

 
$
1,098

 
$
473

 
$
144

 
$

 
$
617


(1) 
Included in other assets in our consolidated balance sheets.
(2) 
Included in accrued expenses and other liabilities in our consolidated balance sheets.
Schedule of investments measured at fair value with Level 3 Input
The changes in investments measured at fair value for which our Investment segment has used Level 3 input to determine fair value are as follows:
 
Three Months Ended March 31,
  
2013
 
2012
 
(in millions)
Balance at January 1
$
288


$
289

Gross realized and unrealized gains (losses)
4

 
(13
)
Gross proceeds
(2
)
 
(3
)
Balance at March 31
$
290


$
273

Other Segments and Holding Company [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Other Segments and Holding Company
The following table summarizes the valuation of our Automotive and Energy segments and our Holding Company investments, derivative contracts and other liabilities by the above fair value hierarchy levels as of March 31, 2013 and December 31, 2012:
 
March 31, 2013
 
December 31, 2012
  
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
(in millions)
Marketable equity and debt securities
$
1

 
$

 
$

 
$
1

 
$
1

 
$

 
$

 
$
1

Trading securities

 

 
125

 
125

 

 

 
60

 
60

Derivative contracts, at fair value(1)

 
1

 

 
1

 

 
1

 
21

 
22

 
$
1

 
$
1

 
$
125


$
127

 
$
1

 
$
1

 
$
81

 
$
83

Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other liabilities
$

 
$
32

 
$

 
$
32

 
$

 
$
1

 
$

 
$
1

Derivative contracts, at fair value(2)

 
45

 

 
45

 

 
89

 

 
89

 
$

 
$
77

 
$

 
$
77

 
$

 
$
90

 
$

 
$
90


(1) 
Amounts are classified within other assets in our consolidated balance sheets.
(2) 
Amounts are classified within accrued expenses and other liabilities in our consolidated balance sheets.
Holding Company [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Schedule of investments measured at fair value with Level 3 Input
The changes in trading securities measured at fair value for which our Holding Company have used Level 3 input to determine fair value are as follows:
 
Three Months Ended March 31,
 
2013
 
2012
 
(in millions)
Balance at January 1
$
81

 
$

Purchase
46

 

Gross unrealized losses
(2
)
 

Balance at March 31
$
125

 
$