Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Long-Term Debt

	June 30, 2020				December 31, 2019
($ in millions)		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Total debt	$	17,511	$	7,467	$	17,516	$	12,026