Pension and Postretirement Benefit Plans - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Qualified and Non-qualified Pension Benefits
Benefit Plan Information
Company contributions year to date	$ 78
Postretirement Benefits
Benefit Plan Information
Company contributions year to date	2
Pension and Postretirement Benefit Plans | Minimum
Benefit Plan Information
Estimated pension and postretirement employer contributions in current fiscal year	100
Pension and Postretirement Benefit Plans | Maximum
Benefit Plan Information
Estimated pension and postretirement employer contributions in current fiscal year	$ 200