Pension and Postretirement Benefit Plans - Special termination benefits (Details) $ in Millions |
1 Months Ended | 3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
May 31, 2019
item
|
Jun. 30, 2019
USD ($)
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
|
| Benefit Plan Information | |||||
| Defined benefit pension and postretirement plans adjustment | $ 560 | $ (444) | $ (52) | ||
| Qualified and Non-qualified Pension Benefits | United States | Funded | |||||
| Benefit Plan Information | |||||
| Special termination benefits - number of additional years of pension service | item | 1 | ||||
| Special termination benefits - number of additional years of age for certain benefit calculations | item | 1 | ||||
| Special termination benefits charge | $ 35 | ||||
| Postretirement Benefits | Funded | |||||
| Benefit Plan Information | |||||
| Defined benefit pension and postretirement plans adjustment | $ 150 | ||||