Employee Benefit Plans - Schedule Fair Value of the Pension Assets (Details) - Pension Benefits - USD ($)
$ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
$ 3,004
|
$ 1,866
|
$ 2,059
|
| U.S. equity securities |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
258
|
215
|
|
| Global equity securities |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
333
|
338
|
|
| Fixed income and cash investment funds |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
1,858
|
937
|
|
| Other debt securities |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
3
|
4
|
|
| Private equities |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
51
|
60
|
|
| Real estate |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
84
|
35
|
|
| Other investments |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Fair values of the plan assets by asset category and by levels of fair value |
$ 417
|
$ 277
|
|