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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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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 Period | $ 31 | $ 37 | $ 41
Charged to Costs & Expenses | 24 | 14 | 10
Charged to Other Accounts | 0 | 0 | 0
Deductions | 11 | 20 | 14
Balance at End of Period | 44 | 31 | 37
Deferred Tax Asset Valuation Allowance [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 485 | 415 | 445
Charged to Costs & Expenses | 23 | 100 | 0
Charged to Other Accounts | 0 | 0 | 0
Deductions | 156 | 30 | 30
Balance at End of Period | $ 352 | $ 485 | $ 415

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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