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Segment Disclosures (Tables)
 6 Months Ended
Jun. 30, 2017
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 Operations and Total assets by reportable segment.
 
Williams
Partners
 
Other
 
Eliminations
 
Total
 
(Millions)
Three Months Ended June 30, 2017
Segment revenues:
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
External
$
1,276

 
$
6

 
$
—

 
$
1,282

Internal
1

 
3

 
(4
)
 
—

Total service revenues
1,277

 
9

 
(4
)
 
1,282

Product sales
 
 
 
 
 
 
 
External
642

 
—

 
—

 
642

Internal
—

 
—

 
—

 
—

Total product sales
642

 
—

 
—

 
642

Total revenues
$
1,919

 
$
9

 
$
(4
)
 
$
1,924

 
 
 
 
 
 
 
 
Three Months Ended June 30, 2016
Segment revenues:
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
External
$
1,193

 
$
9

 
$
—

 
$
1,202

Internal
17

 
3

 
(20
)
 
—

Total service revenues
1,210

 
12

 
(20
)
 
1,202

Product sales
 
 
 
 
 
 
 
External
530

 
4

 
—

 
534

Internal
—

 
10

 
(10
)
 
—

Total product sales
530

 
14

 
(10
)
 
534

Total revenues
$
1,740

 
$
26

 
$
(30
)
 
$
1,736

 
 
 
 
 
 
 
 
Six Months Ended June 30, 2017
Segment revenues:
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
External
$
2,532

 
$
11

 
$
—

 
$
2,543

Internal
1

 
6

 
(7
)
 
—

Total service revenues
2,533

 
17

 
(7
)
 
2,543

Product sales
 
 
 
 
 
 
 
External
1,369

 
—

 
—

 
1,369

Internal
—

 
—

 
—

 
—

Total product sales
1,369

 
—

 
—

 
1,369

Total revenues
$
3,902

 
$
17

 
$
(7
)
 
$
3,912

 
 
 
 
 
 
 
 
Six Months Ended June 30, 2016
Segment revenues:
 
 
 
 
 
 
 
Service revenues
 
 
 
 
 
 
 
External
$
2,415

 
$
16

 
$
—

 
$
2,431

Internal
21

 
14

 
(35
)
 
—

Total service revenues
2,436

 
30

 
(35
)
 
2,431

Product sales
 
 
 
 
 
 
 
External
958

 
7

 
—

 
965

Internal
—

 
10

 
(10
)
 
—

Total product sales
958

 
17

 
(10
)
 
965

Total revenues
$
3,394

 
$
47

 
$
(45
)
 
$
3,396

 
 
 
 
 
 
 
 
June 30, 2017
 
 
 
 
 
 
 
Total assets
$
48,218

 
$
688

 
$
(136
)
 
$
48,770

December 31, 2016
 
 
 
 
 
 
 
Total assets
$
46,265

 
$
685

 
$
(115
)
 
$
46,835
Reconciliation of Modified EBITDA to Net Income (Loss) [Table Text Block]
The following table reflects the reconciliation of Modified EBITDA to Net income (loss) as reported in the Consolidated Statement of Operations.
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
(Millions)
Modified EBITDA by segment:
 
 
 
 
 
 
 
Williams Partners
$
1,076

 
$
604

 
$
2,208

 
$
1,559

Other
(17
)
 
(430
)
 
1

 
(467
)
 
1,059

 
174

 
2,209

 
1,092

Accretion expense associated with asset retirement obligations for nonregulated operations
(9
)
 
(8
)
 
(16
)
 
(15
)
Depreciation and amortization expenses
(433
)
 
(446
)
 
(875
)
 
(891
)
Equity earnings (losses)
125

 
101

 
232

 
198

Impairment of equity-method investments
—

 
—

 
—

 
(112
)
Other investing income (loss) – net
2

 
18

 
274

 
36

Proportional Modified EBITDA of equity-method investments
(215
)
 
(191
)
 
(409
)
 
(380
)
Interest expense
(271
)
 
(298
)
 
(551
)
 
(589
)
(Provision) benefit for income taxes
(65
)
 
145

 
(102
)
 
143

Net income (loss)
$
193

 
$
(505
)
 
$
762

 
$
(518
)