Derivatives - Offsetting Assets (Details) $ in Millions |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2018
USD ($)
Counterparty
|
Dec. 31, 2017
USD ($)
|
|
| Offsetting of Financial Assets under Master Netting Agreements with Derivative Counterparties | ||
| Number of master netting agreements supported by primary counterparty's parent guarantee | Counterparty | 17 | |
| Number of credit support agreements by primary counterparty | Counterparty | 16 | |
| Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet | $ 146 | $ 78 |
| Net Amount of Derivative Assets | 108 | 51 |
| Derivatives subject to master netting agreements | ||
| Offsetting of Financial Assets under Master Netting Agreements with Derivative Counterparties | ||
| Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet | 146 | 78 |
| Gross Amount of Eligible Offsetting Recognized Derivative Liabilities | 38 | 27 |
| Net Amount of Derivative Assets | $ 108 | $ 51 |