Employee Benefit Plans - Balance Sheet Position (Details) - USD ($)
$ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Pension and Other Postretirement Defined Benefit Plans, Liabilities |
|
|
| Noncurrent liabilities |
$ (8,452)
|
$ (9,163)
|
| Pension Benefits |
|
|
| Pension and Other Postretirement Defined Benefit Plans, Liabilities |
|
|
| Current liabilities |
(19)
|
(27)
|
| Noncurrent liabilities |
(5,335)
|
(6,323)
|
| Total liabilities |
(5,354)
|
(6,350)
|
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax |
|
|
| Net actuarial loss |
(8,765)
|
(8,682)
|
| Prior service credit |
0
|
0
|
| Total accumulated other comprehensive loss, pre-tax |
(8,765)
|
(8,682)
|
| Other Postretirement and Postemployment Benefits |
|
|
| Pension and Other Postretirement Defined Benefit Plans, Liabilities |
|
|
| Current liabilities |
(125)
|
(123)
|
| Noncurrent liabilities |
(2,647)
|
(2,465)
|
| Total liabilities |
(2,772)
|
(2,588)
|
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax |
|
|
| Net actuarial loss |
(715)
|
(613)
|
| Prior service credit |
38
|
47
|
| Total accumulated other comprehensive loss, pre-tax |
$ (677)
|
$ (566)
|