Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Long-Term Debt

	Successor				Predecessor
	June 30, 2021				December 31, 2020
($ in millions)		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Total debt	$	7,022	$	7,105	$	16,769	$	11,635