Derivative and Financial Instruments - Cost Basis to Fair Value (Details) $ in Millions |
Dec. 31, 2019
USD ($)
|
|---|---|
| Schedule of Available-for-sale Securities [Line Items] | |
| Amortized Cost Basis | $ 241 |
| Investments, Fair Value Disclosure | 241 |
| Corporate Debt [Member] | |
| Schedule of Available-for-sale Securities [Line Items] | |
| Amortized Cost Basis | 159 |
| Investments, Fair Value Disclosure | 159 |
| US Government Debt Securities [Member] | |
| Schedule of Available-for-sale Securities [Line Items] | |
| Amortized Cost Basis | 25 |
| Investments, Fair Value Disclosure | 25 |
| Commercial Paper [Member] | |
| Schedule of Available-for-sale Securities [Line Items] | |
| Amortized Cost Basis | 38 |
| Investments, Fair Value Disclosure | 38 |
| Asset-backed Securities [Member] | |
| Schedule of Available-for-sale Securities [Line Items] | |
| Amortized Cost Basis | 19 |
| Investments, Fair Value Disclosure | $ 19 |