Derivatives - Offsetting Assets (Details) $ in Millions |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2016
USD ($)
Counterparty
|
Dec. 31, 2015
USD ($)
|
|
| Offsetting of Financial Assets under Master Netting Agreements with Derivative Counterparties | ||
| Number of master netting agreements supported by primary counterparty's parent guarantee | Counterparty | 16 | |
| Number of credit support agreements by primary counterparty | Counterparty | 15 | |
| Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet | $ 259 | $ 296 |
| Net Amounts of Derivative Assets | 220 | 259 |
| 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 | 259 | 296 |
| Gross Amount of Eligible Offsetting Recognized Derivative Liabilities | 39 | 37 |
| Net Amounts of Derivative Assets | $ 220 | $ 259 |