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Redeemable Preferred Units (Tables)
12 Months Ended
Dec. 31, 2018
Redeemable Preferred Units Disclosure [Abstract]  
Rollforward of Redeemable Preferred Units
The changes in the redeemable preferred balance for 2018 and 2017 are summarized below:
(In millions)
2018
 
2017
Balance at beginning of period
$
1,000

 
$
1,000

Net income allocated
75

 
65

Distributions received by preferred unitholders
(71
)
 
(65
)
Balance at end of period
$
1,004

 
$
1,000