v3.19.3.a.u2
Pension And Postretirement Benefits (Employee Benefit Obligation Amounts Recognized) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Pension Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current portion of employee benefit obligation [1] $ 0 $ 0
Employee benefit obligation [2] (6,343) (3,758)
Net amount recognized (6,343) (3,758)
Postretirement Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current portion of employee benefit obligation [1] (1,365) (1,464)
Employee benefit obligation [2] (10,531) (13,637)
Net amount recognized $ (11,896) $ (15,101)
[1] Included in “Accounts payable and accrued liabilities.”
[2] Included in “Postemployment benefit obligation.”