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Redeemable Preferred Units (Tables)
6 Months Ended
Jun. 30, 2017
Temporary Equity Disclosure [Abstract]  
Temporary Equity [Table Text Block]
The changes in the redeemable preferred balance from December 31, 2016 through June 30, 2017 are summarized below:
(In millions)
Redeemable Preferred Units
Balance at December 31, 2016
$
1,000

Net income
33

Distributions received by Preferred unitholders
(33
)
Balance at June 30, 2017
$
1,000