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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Valuation allowance, increase (decrease) | $ 156 |  |  |
Valuation allowance for deferred tax assets |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Year | 4,576 | $ 4,507 | $ 4,575 |
Other Additions (Deductions) | 200 | 50 | (345) |
Additons Charged to Other Accounts | (16) | 19 | 8 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) | (28) | 0 | 269 |
Balance at End of Year | 4,732 | 4,576 | 4,507 | $ 4,575
Reserve for Taxes, Other than Income Taxes [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Year | 58 | 62 | 58 |
Other Additions (Deductions) | 21 | 0 | 7 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | (1) | 0 | (1) |
SEC Schedule, 12-09, Valuation Allowance and Reserves, Deduction, Other | 4 | (4) | (2) |
Balance at End of Year | 82 | 58 | 62 | 58
Net Operating Losses |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Valuation allowance, increase (decrease) | 250 |  |  | $ (45)
Domestic Deferred Tax Assets [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Valuation allowance, increase (decrease) | $ (11) | $ 208 | (44) |
Foreign Operating Losses [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Valuation allowance, increase (decrease) |  |  | $ 244 |

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318 + Details
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