Pensions Benefit Obligation in Excess of Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 2,010	$ 2,047
Fair value of plan assets	1,521	1,529
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	1,937	1,976
Fair value of plan assets	$ 1,521	$ 1,526