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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Schedule of 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, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 2,384 | $ 2,546 |
Charged to Other Accounts | 5,287 | 5,887 |
Deductions | (5,637) | (6,049) |
Balance at End of Year | 2,050 | 2,384 | $ 2,546
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 47 | 97 | 80
Charged to Costs and Expenses | 10 | 4 | 33
Charged to Other Accounts | (1) | (4) | 4
Deductions | (8) | (50) | (20)
Balance at End of Year | 48 | 47 | 97
Deferred tax asset valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 2,913 | 2,001 | 1,857
Charged to Costs and Expenses | 13 | 870 | 221
Charged to Other Accounts | (95) | 42 | (77)
Deductions | 0 | 0 | 0
Balance at End of Year | $ 2,831 | $ 2,913 | $ 2,001

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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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