Disclosures About Segments And Related Information (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Disclosures About Segments And Related Information [Abstract] | |||
| Non-debt-related interest expense | $ 105 | $ 84 | $ 136 |