Retirement and Postretirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Postretirement and Other Benefit Plans Disclosure
Contributions to defined benefit plans	$ 1	$ 5	$ 1	$ 152
Pension Benefit
Postretirement and Other Benefit Plans Disclosure
Net periodic benefit costs (gains)	1	(7)	1	(18)
Postretirement Benefit
Postretirement and Other Benefit Plans Disclosure
Net periodic benefit costs (gains)	$ 19	$ 18	$ 38	$ 38