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Employee Benefit Plans - Allocation of Plan Assets (Details) - Fair Value, Recurring - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | $ 583 | $ 654
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 336 | 315
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 9 | 10
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 24 | 17
Cash and cash equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 0 | 0
Cash and cash equivalents | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 0 | 0
Equity securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 20 | 134
Equity securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 175 | 123
Equity securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed income securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 213 | 188
Fixed income securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 165 | 214
Fixed income securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 0 | 0
Other investments | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | 326 | 315
Other investments | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | (4) | (22)
Other investments | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments at fair value | $ 9 | $ 10

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