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Segment Disclosures (Tables)
 6 Months Ended
Jun. 30, 2015
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
The following table reflects the reconciliation of Segment revenues to Total revenues as reported in the Consolidated Statement of Income and Total assets by reportable segment.
 
Williams
Partners
 
Williams
NGL & Petchem
Services (1)
 
Other
 
Eliminations
 
Total
 
(Millions)
Three Months Ended June 30, 2015
 
Segment revenues:
 
 
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
 
 
External
$
1,231

 
$
1

 
$
9

 
$
—

 
$
1,241

Internal
—

 
—

 
38

 
(38
)
 
—

Total service revenues
1,231

 
1

 
47

 
(38
)
 
1,241

Product sales
 
 
 
 
 
 
 
 
 
External
598

 
—

 
—

 
—

 
598

Internal
1

 
—

 
—

 
(1
)
 
—

Total product sales
599

 
—

 
—

 
(1
)
 
598

Total revenues
$
1,830

 
$
1

 
$
47

 
$
(39
)
 
$
1,839

 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2014
Segment revenues:
 
 
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
 
 
External
$
763

 
$
—

 
$
62

 
$
—

 
$
825

Internal
—

 
—

 
4

 
(4
)
 
—

Total service revenues
763

 
—

 
66

 
(4
)
 
825

Product sales
 
 
 
 
 
 
 
 
 
External
853

 
—

 
—

 
—

 
853

Internal
—

 
—

 
—

 
—

 
—

Total product sales
853

 
—

 
—

 
—

 
853

Total revenues
$
1,616

 
$
—

 
$
66

 
$
(4
)
 
$
1,678

 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2015
Segment revenues:
 
 
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
 
 
External
$
2,423

 
$
1

 
$
14

 
$
—

 
$
2,438

Internal
—

 
—

 
59

 
(59
)
 
—

Total service revenues
2,423

 
1

 
73

 
(59
)
 
2,438

Product sales
 
 
 
 
 
 
 
 
 
External
1,117

 
—

 
—

 
—

 
1,117

Internal
1

 
—

 
—

 
(1
)
 
—

Total product sales
1,118

 
—

 
—

 
(1
)
 
1,117

 
Williams
Partners
 
Williams
NGL & Petchem
Services (1)
 
Other
 
Eliminations
 
Total
 
(Millions)
Total revenues
$
3,541

 
$
1

 
$
73

 
$
(60
)
 
$
3,555

 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2014
Segment revenues:
 
 
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
 
 
External
$
1,526

 
$
—

 
$
118

 
$
—

 
$
1,644

Internal
—

 
—

 
7

 
(7
)
 
—

Total service revenues
1,526

 
—

 
125

 
(7
)
 
1,644

Product sales
 
 
 
 
 
 
 
 
 
External
1,783

 
—

 
—

 
—

 
1,783

Internal
—

 
—

 
—

 
—

 
—

Total product sales
1,783

 
—

 
—

 
—

 
1,783

Total revenues
$
3,309

 
$
—

 
$
125

 
$
(7
)
 
$
3,427

 
 
 
 
 
 
 
 
 
 
June 30, 2015
 
 
 
 
 
 
 
 
 
Total assets
$
50,040

 
$
731

 
$
1,064

 
$
(672
)
 
$
51,163

December 31, 2014
 
 
 
 
 
 
 
 
 
Total assets
$
49,322

 
$
612

 
$
1,220

 
$
(591
)
 
$
50,563

_________________
(1)
Includes certain projects under development and thus nominal reported revenues to date.
Reconciliation of Modified EBITDA to Segment to Consolidated [Table Text Block]
The following table reflects the reconciliation of Modified EBITDA to Net income (loss) as reported in the Consolidated Statement of Income.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(Millions)
Modified EBITDA by Segment:
 
 
 
 
 
 
 
Williams Partners
$
1,053

 
$
596

 
$
1,870

 
$
1,304

Williams NGL & Petchem Services
(3
)
 
(8
)
 
(8
)
 
(108
)
Other
(4
)
 
60

 
(4
)
 
118

 
1,046

 
648

 
1,858

 
1,314

Accretion expense associated with asset retirement obligations for nonregulated operations
(9
)
 
(6
)
 
(15
)
 
(9
)
Depreciation and amortization expenses
(428
)
 
(214
)
 
(855
)
 
(428
)
Equity earnings (losses)
93

 
37

 
144

 
(11
)
Other investing income (loss) – net
9

 
18

 
9

 
32

Proportional Modified EBITDA of equity-method investments
(183
)
 
(113
)
 
(319
)
 
(141
)
Interest expense
(262
)
 
(163
)
 
(513
)
 
(303
)
(Provision) benefit for income taxes
(83
)
 
(84
)
 
(113
)
 
(135
)
Income (loss) from discontinued operations, net of tax
—

 
4

 
—

 
4

Net income (loss)
$
183

 
$
127

 
$
196

 
$
323