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Condensed Consolidated Statements of Changes in Equity shares in Thousands, $ in Millions | USD ($) $ / shares shares | Series A Convertible Preferred Units [Member] shares | Preferred Units [Member] shares | Preferred Partner [Member] USD ($) shares | Units [Member] USD ($) shares | Limited Partners [Member] USD ($) | Accumulated Other Comprehensive Income (Loss) [Member] USD ($) | Non-controlling Interests [Member] USD ($) | Common Stock [Member] $ / shares
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Beginning balance, units at Dec. 31, 2017 | shares |  |  |  |  | 14,000 |  | 54,300 |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 |  | $ 2,224.0 | [1] |  |  | $ 548.0 |  | $ 1,641.0 | [1] | $ 1.0 | $ 34.0 | [1] |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Related party note receivable | [1] | 29.0 |  |  |  |  |  |  |  |  | 29.0 |  |
Net income (loss) |  | (19.0) | [1] |  |  | 6.0 |  | 74.0 | [1] |  | (99.0) | [1] |
Other comprehensive income (loss) | [1] | 1.0 |  |  |  |  |  |  |  |  | 1.0 |  |
Related party distributions | [1] | (64.0) |  |  |  |  |  |  |  |  | (64.0) |  |
Other differential membership interests activity | [1] | 23.0 |  |  |  |  |  |  |  |  | 23.0 |  |
Changes in non-economic ownership interests | [1] | (6.0) |  |  |  |  |  |  |  |  | (6.0) |  |
Distributions to unitholders | [2] | (28.0) | [1] |  |  | (6.0) |  | (22.0) | [1] |  |  |  |
Ending balance, units at Mar. 31, 2018 | shares |  |  |  |  | 14,000 |  | 54,300 |  |  |  |  |  |
Ending balance at Mar. 31, 2018 |  | $ 3,583.0 | [1] |  |  | 548.0 |  | 1,702.0 | [1] | 1.0 | 1,332.0 | [1] |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per common unit (usd per share) | $ / shares |  | $ 0.4050 |  |  |  |  |  |  |  |  |  |  |
Beginning balance, units at Dec. 31, 2017 | shares |  |  |  |  | 14,000 |  | 54,300 |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 |  | $ 2,224.0 | [1] |  |  | 548.0 |  | 1,641.0 | [1] | 1.0 | 34.0 | [1] |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [3],[4] | 383.0 |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | [5] | 4.0 |  |  |  |  |  |  |  |  |  |  |
Ending balance, units at Sep. 30, 2018 | shares |  |  |  |  | 14,000 |  | 56,000 |  |  |  |  |  |
Ending balance at Sep. 30, 2018 |  | 4,046.0 | [1] |  |  | 548.0 |  | 1,847.0 | [1] | (5.0) | 1,656.0 | [1] |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued preferred distributions | [4] | 6.0 |  |  |  |  |  |  |  |  |  |  |
Beginning balance, units at Mar. 31, 2018 | shares |  |  |  |  | 14,000 |  | 54,300 |  |  |  |  |  |
Beginning balance at Mar. 31, 2018 |  | 3,583.0 | [1] |  |  | 548.0 |  | 1,702.0 | [1] | 1.0 | 1,332.0 | [1] |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Related party note receivable | [1] | 2.0 |  |  |  |  |  |  |  |  | 2.0 |  |
Net income (loss) |  | 292.0 | [1] |  |  | 6.0 |  | 82.0 | [1] |  | 204.0 | [1] |
Other comprehensive income (loss) | [1] | (5.0) |  |  |  |  |  |  |  | (1.0) | (4.0) |  |
Related party distributions | [1] | (41.0) |  |  |  |  |  |  |  |  | (41.0) |  |
Other differential membership interests activity | [1] | (6.0) |  |  |  |  |  |  |  |  | (6.0) |  |
Changes in non-economic ownership interests | [1] | 1.0 |  |  |  |  |  |  |  |  | 1.0 |  |
Distributions to unitholders | [2] | (29.0) | [1] |  |  | (6.0) |  | (23.0) | [1] |  |  |  |
Disposal of Canadian Holdings |  | 107.0 | [1] |  |  |  |  |  |  | 2.0 | 105.0 |  |
Ending balance, units at Jun. 30, 2018 | shares |  |  |  |  | 14,000 |  | 54,300 |  |  |  |  |  |
Ending balance at Jun. 30, 2018 |  | $ 3,904.0 | [1] |  |  | $ 548.0 |  | 1,759.0 | [1] | 2.0 | 1,595.0 | [1] |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per common unit (usd per share) | $ / shares |  | $ 0.4200 |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Distributions |  | $ (2.0) |  |  |  |  |  | (2.0) |  |  |  |  |
Issuance of common units (in units) | shares | [6] |  |  |  | 0 | 0 | (1,700) |  |  |  |  |  |
Issuance of common units - net | [6] | 81.0 |  |  |  |  |  | 81.0 |  |  |  |  |
Net income (loss) |  | 110.0 | [1],[3] |  |  | $ 6.0 |  | 33.0 | [1] |  | 71.0 | [1] |
Other comprehensive income (loss) | [1] | 8.0 | [5] |  |  |  |  |  |  | (7.0) | 15.0 |  |
Related party contributions |  | 1.0 |  |  |  |  |  |  |  |  | 1.0 |  |
Related party distributions |  | (48.0) |  |  |  |  |  |  |  |  | (48.0) |  |
Other differential membership interests activity | [1] | 23.0 |  |  |  |  |  |  |  |  | 23.0 |  |
Changes in non-economic ownership interests | [1] | (1.0) |  |  |  |  |  |  |  |  | (1.0) |  |
Distributions to unitholders | [2] | (30.0) | [1] |  |  | (6.0) |  | (24.0) | [1] |  |  |  |
Ending balance, units at Sep. 30, 2018 | shares |  |  |  |  | 14,000 |  | 56,000 |  |  |  |  |  |
Ending balance at Sep. 30, 2018 |  | $ 4,046.0 | [1] |  |  | 548.0 |  | 1,847.0 | [1] | (5.0) | 1,656.0 | [1] |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per common unit (usd per share) | $ / shares |  | $ 0.4375 |  |  |  |  |  |  |  |  |  |  |
Beginning balance, units at Dec. 31, 2018 | shares |  | 56,100 |  |  | 14,000 |  | 56,100 |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 |  | $ 5,538.0 |  |  |  | 548.0 |  | 1,804.0 |  | (6.0) | 3,192.0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units (in units) | shares |  |  |  |  |  |  | (100) |  |  |  |  |  |
Issuance of common units - net |  | 1.0 |  |  |  |  |  | 1.0 |  |  |  |  |
Net income (loss) |  | (121.0) |  |  |  | 6.0 |  | (22.0) |  |  | (105.0) |  |
Other comprehensive income (loss) |  | (5.0) |  |  |  |  |  |  |  | (2.0) | (3.0) |  |
Related party contributions |  | 1.0 |  |  |  |  |  |  |  |  | 1.0 |  |
Related party distributions |  | (51.0) |  |  |  |  |  |  |  |  | (51.0) |  |
Other differential membership interests activity |  | 24.0 |  |  |  |  |  |  |  |  | 24.0 |  |
Changes in non-economic ownership interests |  | (6.0) |  |  |  |  |  |  |  |  | (6.0) |  |
Payments to Class B noncontrolling interests investors |  | (5.0) |  |  |  |  |  |  |  |  | (5.0) |  |
Distributions to unitholders | [7] | (32.0) |  |  |  | (6.0) |  | (26.0) |  |  |  |  |
Other |  | 1.0 |  |  |  |  |  |  |  |  | 1.0 |  |
Ending balance, units at Mar. 31, 2019 | shares |  |  |  |  | 14,000 |  | 56,200 |  |  |  |  |  |
Ending balance at Mar. 31, 2019 |  | $ 5,345.0 |  |  |  | 548.0 |  | 1,757.0 |  | (8.0) | 3,048.0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per common unit (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4650
Beginning balance, units at Dec. 31, 2018 | shares |  | 56,100 |  |  | 14,000 |  | 56,100 |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 |  | $ 5,538.0 |  |  |  | 548.0 |  | 1,804.0 |  | (6.0) | 3,192.0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (488.0) |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | $ (5.0) |  |  |  |  |  |  |  |  |  |  |
Ending balance, units at Sep. 30, 2019 | shares |  | 60,800 |  |  | 9,300 |  | 60,800 |  |  |  |  |  |
Ending balance at Sep. 30, 2019 |  | $ 6,176.0 |  |  |  | 365.0 |  | 1,803.0 |  | (8.0) | 4,016.0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued preferred distributions |  | 4.0 |  |  |  |  |  |  |  |  |  |  |
Beginning balance, units at Mar. 31, 2019 | shares |  |  |  |  | 14,000 |  | 56,200 |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 |  | 5,345.0 |  |  |  | 548.0 |  | 1,757.0 |  | (8.0) | 3,048.0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units - net |  | 1.0 |  |  |  |  |  | 1.0 |  |  |  |  |
Changes in non-economic ownership interests |  | 472.0 |  |  |  |  |  |  |  |  | 472.0 |  |
Related party note receivable |  | 1.0 |  |  |  |  |  |  |  |  | 1.0 |  |
Net income (loss) |  | (124.0) |  |  |  | 6.0 |  | (28.0) |  |  | (102.0) |  |
Other comprehensive income (loss) |  | 0.0 |  |  |  |  |  |  |  |  |  |  |
Related party contributions |  | 11.0 |  |  |  |  |  |  |  |  | 11.0 |  |
Related party distributions |  | (56.0) |  |  |  |  |  |  |  |  | (56.0) |  |
Other differential membership interests activity |  | (8.0) |  |  |  |  |  |  |  |  | (8.0) |  |
Payments to Class B noncontrolling interests investors |  | (3.0) |  |  |  |  |  |  |  |  | (3.0) |  |
Distributions to unitholders | [7] | (33.0) |  |  |  | (6.0) |  | (27.0) |  |  |  |  |
Sale of Class B noncontrolling interest - net |  | 893.0 |  |  |  |  |  |  |  |  | 893.0 |  |
Other |  | 1.0 |  |  |  |  |  | 1.0 |  |  |  |  |
Ending balance, units at Jun. 30, 2019 | shares |  |  |  |  | 14,000 |  | 56,200 |  |  |  |  |  |
Ending balance at Jun. 30, 2019 |  | 6,500.0 |  |  |  | $ 548.0 |  | 1,704.0 |  | (8.0) | 4,256.0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per common unit (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | 0.4825
Partners' Capital Account, Contributions |  |  |  |  |  |  |  | 20.0 |  |  |  |  |
Issuance of common units (in units) | shares | [6] |  |  |  | (4,700) | (183,000) | (4,700) |  |  |  |  |  |
Issuance of common units - net | [6] | 20.0 |  |  |  |  |  | 203.0 |  |  |  |  |
Changes in non-economic ownership interests |  | 11.0 |  |  |  |  |  | 1.0 |  |  | 10.0 |  |
Net income (loss) |  | (243.0) |  |  |  | $ 2.0 |  | (72.0) |  |  | (173.0) |  |
Other comprehensive income (loss) |  | 0.0 |  |  |  |  |  |  |  |  |  |  |
Related party distributions |  | (71.0) |  |  |  |  |  |  |  |  | (71.0) |  |
Other differential membership interests activity |  | 27.0 |  |  |  |  |  |  |  |  | 27.0 |  |
Changes in non-economic ownership interests |  | (6.0) |  |  |  |  |  |  |  |  | (6.0) |  |
Payments to Class B noncontrolling interests investors |  | (7.0) |  |  |  |  |  |  |  |  | (7.0) |  |
Distributions to unitholders | [7] | (33.0) |  |  |  | (2.0) |  | (31.0) |  |  |  |  |
Other |  | $ 0.0 |  |  |  |  | $ (0.1) | 0.0 |  |  |  |  |
Ending balance, units at Sep. 30, 2019 | shares |  | 60,800 |  |  | 9,300 |  | 60,800 |  |  |  |  |  |
Ending balance at Sep. 30, 2019 |  | $ 6,176.0 |  |  |  | $ 365.0 |  | $ 1,803.0 |  | $ (8.0) | $ 4,016.0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions per common unit (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5025
Conversion of stock, shares converted (in shares) | shares |  |  |  | 4,670 |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  | 1 |  |  |  |  |  |  |  |  |
[1] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.
[2] | Distributions per common unit of $0.4375, $0.4200 and $0.4050 were paid during the three months ended September 30, 2018, June 30, 2018 and March 31, 2018, respectively.
[3] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.
[4] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.
[5] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.
[6] | During the three months ended September 30, 2019, NEP converted approximately 4.67 million Series A convertible preferred units into NEP common units on a one-for-one basis and recognized a deferred tax asset of $20 million related to the issuance of NEP common units.
[7] | Distributions per common unit of $0.5025, $0.4825 and $0.4650 were paid during the three months ended September 30, 2019, June 30, 2019 and March 31, 2019, respectively. At September 30, 2019, $4 million of preferred unit distributions were accrued and are payable in November 2019.

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