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Summary of Significant Accounting and Reporting Policies (Tables)
 9 Months Ended
Sep. 30, 2019
Non-controlling Interests [Member]  
Noncontrolling Interest [Line Items]  
Schedule of Noncontrolling Interest Details of the activity in noncontrolling interests are below:
 
 
 Class B Noncontrolling Ownership Interests
 
Differential Membership Interests
 
Noncontrolling Ownership Interests in NEP OpCo, Silver State and Texas pipeline
 
Total Noncontrolling
Interests
Nine months ended September 30, 2019
 
(millions)
Balances, December 31, 2018
 
$
751

 
$
2,019

 
$
422

 
$
3,192

Net income (loss) attributable to NCI
 
12

 
(60
)
 
(57
)
 
(105
)
Other comprehensive loss
 
—

 
—

 
(3
)
 
(3
)
Related party contributions
 
—

 
—

 
1

 
1

Related party distributions
 
—

 
—

 
(51
)
 
(51
)
Changes in non-economic ownership interests
 
—

 
—

 
(6
)
 
(6
)
Differential membership interests contributions, net of distributions
 
—

 
24

 
—

 
24

Payments to Class B noncontrolling interest investors
 
(5
)
 
—

 
—

 
(5
)
Other
 
—

 
—

 
1

 
1

Balances, March 31, 2019
 
758

 
1,983

 
307

—

3,048

Sale of Class B noncontrolling interest - net
 
893

 
—

 
—

 
893

Acquisition of subsidiaries with noncontrolling ownership interest
 
—

 
—

 
472

 
472

Related party note receivable
 
—

 
—

 
1

 
1

Net income (loss) attributable to NCI
 
25

 
(63
)
 
(64
)
 
(102
)
Related party contributions
 
—

 
—

 
11

 
11

Related party distributions
 
—

 
—

 
(56
)
 
(56
)
Differential membership interests contributions, net of distributions
 
—

 
(8
)
 
—

 
(8
)
Payments to Class B noncontrolling interest investors
 
(3
)
 
—

 
—

 
(3
)
Balances, June 30, 2019
 
1,673

 
1,912

 
671

—

4,256

Acquisition of subsidiaries with noncontrolling ownership interest
 
—

 
—

 
(10
)
 
(10
)
Net income (loss) attributable to NCI
 
34

 
(64
)
 
(143
)
 
(173
)
Related party distributions
 
—

 
—

 
(71
)
 
(71
)
Changes in non-economic ownership interests
 
—

 
—

 
(6
)
 
(6
)
Differential membership interests contributions, net of distributions
 
—

 
27

 
—

 
27

Payments to Class B noncontrolling interest investors
 
(7
)
 
—

 
—

 
(7
)
Balances, September 30, 2019
 
$
1,700

 
$
1,875

 
$
441

 
$
4,016


 
 
Differential Membership Interests
 
Noncontrolling Ownership Interests in NEP OpCo and Texas pipeline
 
Total Noncontrolling
Interests
Nine months ended September 30, 2018
 
(millions)
Balances, December 31, 2017
 
$
—

 
$
34

 
$
34

Related party note receivable
 
—

 
29

 
29

Net income (loss) attributable to NCI
 
(269
)
 
170

 
(99
)
Other comprehensive income
 
—

 
1

 
1

Related party distributions
 
—

 
(64
)
 
(64
)
Changes in non-economic ownership interests
 
—

 
(6
)
 
(6
)
Differential membership interests contributions, net of distributions
 
23

 
—

 
23

Adoption of accounting standards update
 
1,413

 
1

 
1,414

Balances, March 31, 2018
 
1,167

 
165

—

1,332

Related party note receivable
 
—

 
2

 
2

Net income (loss) attributable to NCI
 
(39
)
 
243

 
204

Other comprehensive loss
 
—

 
(4
)
 
(4
)
Related party distributions
 
—

 
(41
)
 
(41
)
Changes in non-economic ownership interests
 
—

 
1

 
1

Differential membership interests contributions, net of distributions
 
(6
)
 
—

 
(6
)
Disposal of Canadian Holdings
 
—

 
105

 
105

Adoption of accounting standards update
 
—

 
2

 
2

Balances, June 30, 2018
 
1,122

 
473

—

1,595

Net income (loss) attributable to NCI
 
(28
)
 
99

 
71

Other comprehensive income
 
—

 
15

 
15

Related party contributions
 
—

 
1

 
1

Related party distributions
 
—

 
(48
)
 
(48
)
Changes in non-economic ownership interests
 
—

 
(1
)
 
(1
)
Differential membership interests contributions, net of distributions
 
23

 
—

 
23

Balances, September 30, 2018
 
$
1,117

 
$
539

 
$
1,656