Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Information [Abstract]

Schedule of supplemental cash flow information from collateralized securities received

($ in millions)	Three months ended March 31,
	2021		2020
Net change in proceeds managed
Net change in short-term investments	$	(183)	$	370
Operating cash flow (used) provided	(183)		370
Net change in cash	1		—
Net change in proceeds managed	$	(182)	$	370
Cash flows from operating activities
Net change in liabilities
Liabilities for collateral, beginning of period	$	(914)	$	(1,298)
Liabilities for collateral, end of period	(1,096)		(928)
Operating cash flow provided (used)	$	182	$	(370)