Financial Instruments - Available-For-Sale Securities (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Sales of available-for-sale securities | ||
| Proceeds - new guidance | $ 0 | |
| Proceeds - prior year guidance | $ 5 | |
| Gross realized gains (before taxes) - prior year guidance | 1 | |
| Gross realized losses (before taxes) - prior year guidance | 2 | |
| Unrealized holding gains/(losses) on available-for-sale securities | ||
| Net unrealized gains/(losses) arising during the period | (2) | (1) |
| Net unrealized (gains)/losses reclassified to net income | 0 | 1 |
| Writedowns included in net income for the period | $ 0 | $ 0 |
| Maximum contractual maturities of substantially all available-for-sale debt securities | 1 year | |
| X | ||||||||||
- Definition This describes the maximum time frame of the contract terms of the entity's available-for-sale debt securities. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized loss realized upon the write-down of available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow associated with the sale of debt securities classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|