Pension Benefits - Narrative (Details) - Pension Plan $ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2019 USD ($) participant	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense		$ 7	$ 24
Cash contributions to the plans		$ 7	6
Percentage threshold of greater of projected benefit obligation or market value of assets (percent)		10.00%
United States
Defined Benefit Plan Disclosure [Line Items]
Number of participants elected to receive settlement | participant	1,300
Lump sum payments under settlement	$ 49
Pre-tax settlement expense			$ 17