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Redeemable Preferred Units (Tables)
3 Months Ended
Mar. 31, 2018
Temporary Equity Disclosure [Abstract]  
Rollforward of Redeemable Preferred Units
The changes in the redeemable preferred balance from December 31, 2017 through March 31, 2018 are summarized below:
(In millions)
Redeemable Preferred Units
Balance at December 31, 2017
$
1,000

Net income
16

Distributions received by preferred unitholders
(16
)
Balance at March 31, 2018
$
1,000