Schedule of Valuation and Qualifying Accounts Disclosure (Details) - USD ($) $ in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|||
| SEC Schedule, 12-09, Allowance, Credit Loss [Member] | |||||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||||
| Balance at Beginning of Year | $ 9 | $ 9 | $ 6 | ||
| Charged to Expense | (6) | (5) | (4) | ||
| Charged to Other Accounts | (1) | 1 | 2 | ||
| Deductions | [1] | (5) | (6) | (3) | |
| Balance at End of Year | 9 | 9 | 9 | ||
| Deferred Tax Asset Valuation Allowance [Member] | |||||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||||
| Balance at Beginning of Year | 1,000 | 1,168 | 1,581 | ||
| Charged to Expense | (127) | (168) | (413) | ||
| Charged to Other Accounts | 0 | 0 | 0 | ||
| Deductions | [1] | 0 | 0 | 0 | |
| Balance at End of Year | $ 873 | $ 1,000 | $ 1,168 | ||
| |||||