Redeemable Preferred Units (Tables)

12 Months Ended

Dec. 31, 2019

Redeemable Preferred Units Disclosure [Abstract]

Rollforward of Redeemable Preferred Units

The changes in the redeemable preferred balance for 2019 and 2018 are summarized below:

(In millions)	2019			2018
Balance at beginning of period	$	1,004		$	1,000
Net income allocated	81			75
Distributions received by preferred unitholders	(81		)	(71		)
Conversion of preferred units to common units	(36		)	—
Balance at end of period	$	968		$	1,004