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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The following table presents the Company's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):
 
 
Input Levels for Fair Value Measurements
 
 
 
 
 
 
Level 1
 
Level 2
 
Level 3
 
Other(1)
 
Total
As of June 30, 2013
 
 
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
1

 
$
46

 
$
36

 
$
(46
)
 
$
37

Interest rate derivatives
 
—

 
6

 
—

 
—

 
6

Money market mutual funds(2)
 
1,868

 
—

 
—

 
—

 
1,868

Debt securities:
 
 
 
 
 
 
 
 
 
 
United States government obligations
 
118

 
—

 
—

 
—

 
118

International government obligations
 
—

 
1

 
—

 
—

 
1

Corporate obligations
 
—

 
31

 
—

 
—

 
31

Municipal obligations
 
—

 
2

 
—

 
—

 
2

Agency, asset and mortgage-backed obligations
 
—

 
2

 
—

 
—

 
2

Auction rate securities
 
—

 
—

 
42

 
—

 
42

Equity securities:
 
 
 
 
 
 
 
 
 
 
United States companies
 
202

 
—

 
—

 
—

 
202

International companies
 
749

 
—

 
—

 
—

 
749

Investment funds
 
77

 
—

 
—

 
—

 
77

 
 
$
3,015


$
88


$
78


$
(46
)
 
$
3,135

Liabilities:
 
 

 
 

 
 

 
 

 
 

Commodity derivatives
 
$
(5
)

$
(240
)

$
(9
)

$
81

 
$
(173
)
Interest rate derivatives
 
—

 
(5
)
 
—

 
—

 
(5
)
 
 
$
(5
)
 
$
(245
)
 
$
(9
)
 
$
81

 
$
(178
)
 
 
 
Input Levels for Fair Value Measurements
 
 
 
 
 
 
Level 1
 
Level 2
 
Level 3
 
Other(1)
 
Total
As of December 31, 2012
 
 
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
1

 
$
55

 
$
39

 
$
(47
)
 
$
48

Money market mutual funds(2)
 
589

 
—

 
—

 
—

 
589

Debt securities:
 
 
 
 
 
 
 
 
 
 
United States government obligations
 
104

 
—

 
—

 
—

 
104

International government obligations
 
—

 
1

 
—

 
—

 
1

Corporate obligations
 
—

 
32

 
—

 
—

 
32

Municipal obligations
 
—

 
4

 
—

 
—

 
4

Agency, asset and mortgage-backed obligations
 
—

 
6

 
—

 
—

 
6

Auction rate securities
 
—

 
—

 
41

 
—

 
41

Equity securities:
 
 
 
 
 
 
 
 
 
 
United States companies
 
187

 
—

 
—

 
—

 
187

International companies
 
677

 
—

 
—

 
—

 
677

Investment funds
 
71

 
—

 
—

 
—

 
71

 
 
$
1,629

 
$
98

 
$
80

 
$
(47
)
 
$
1,760

Liabilities:
 
 
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
(10
)
 
$
(313
)
 
$
(7
)
 
$
109

 
$
(221
)
Interest rate derivatives
 
—

 
(13
)
 
—

 
—

 
(13
)
 
 
$
(10
)
 
$
(326
)
 
$
(7
)
 
$
109

 
$
(234
)

(1)
Represents netting under master netting arrangements and a net cash collateral receivable of $35 million and $62 million as of June 30, 2013 and December 31, 2012, respectively.
(2)
Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block]
The following table reconciles the beginning and ending balances of the Company's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions):
 
Three-Month Periods
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
 
 
Auction
 
 
 
Auction
 
Commodity
 
Rate
 
Commodity
 
Rate
 
Derivatives
 
Securities
 
Derivatives
 
Securities
2013:
 
 
 
 
 
 
 
Beginning balance
$
36

 
$
42

 
$
32

 
$
41

Changes included in earnings
(5
)
 
—

 
4

 
—

Changes in fair value recognized in other comprehensive income
(2
)
 
—

 
(5
)
 
1

Changes in fair value recognized in net regulatory assets
1

 
—

 
2

 
—

Purchases
—

 
—

 
2

 
—

Settlements
(3
)
 
—

 
(8
)
 
—

Ending balance
$
27

 
$
42

 
$
27

 
$
42


 
Three-Month Periods
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
 
 
Auction
 
 
 
Auction
 
Commodity
 
Rate
 
Commodity
 
Rate
 
Derivatives
 
Securities
 
Derivatives
 
Securities
2012:
 
 
 
 
 
 
 
Beginning balance
$
25

 
$
36

 
$
23

 
$
35

Changes included in earnings
(1
)
 
—

 
9

 
—

Changes in fair value recognized in other comprehensive income
6

 
—

 
3

 
2

Changes in fair value recognized in net regulatory assets
(6
)
 
—

 
3

 
—

Sales
—

 
—

 
—

 
(1
)
Settlements
(7
)
 
—

 
(21
)
 
—

Ending balance
$
17

 
$
36

 
$
17

 
$
36
Fair Value, by Balance Sheet Grouping [Table Text Block]
The Company's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of the Company's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of the Company's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of the Company's long-term debt (in millions):
 
As of June 30, 2013
 
As of December 31, 2012
 
Carrying
 
Fair
 
Carrying
 
Fair
 
Value
 
Value
 
Value
 
Value
 
 
 
 
 
 
 
 
Long-term debt
$
21,934

 
$
24,576

 
$
20,735

 
$
24,924