XML 107 R88.htm IDEA: XBRL DOCUMENT v3.19.2
Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Components of net periodic cost            
Remeasurement gains and (losses) $ 125 $ (7) $ 140 $ 7    
Remeasurement due to change in weighted average discount rate 308   714      
(Increase) decrease for remeasurement due to settlement 42 $ 75 42 $ 75    
Increase (decrease) for actual return (loss) $ 225   $ 616      
Pension benefits            
Components of net periodic cost            
Discount rate 3.53%   3.53%   3.87% 4.30%