Loss per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net loss attributable to shareholder	$ (605)	$ (1,745)
Effect of dilution	0	0
Diluted net loss available to shareholders	$ (605)	$ (1,745)
Basic loss per share:
Weighted average number of common shares outstanding (in shares)	100	100
Diluted loss per share:
Effect of dilution (in shares)	0	0
Weighted average number of common shares outstanding adjusted for the effects of dilution (in shares)	100	100
Basic loss per share (in dollars per share)	$ (6.03)	$ (17.40)
Diluted loss per share (in dollars per share)	$ (6.03)	$ (17.40)

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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