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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Valuation allowance, increase (decrease) |  |  | $ (68) |  |
Tax Cuts and Jobs Act of 2017, change in deferred tax asset valuation allowance | $ 32 | $ 1,100 | 244 | $ 1,100 |
Tax Cuts and Jobs Act of 2017, Tax Credit Carryforwards, Alternative Minimum Tax |  |  |  | 371 |
Valuation allowance for deferred tax assets |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at Beginning of Year |  |  | 4,575 | 6,058 | $ 4,183
Other Additions (Deductions) |  |  | (345) | (1,484) | 1,852
Additons Charged to Other Accounts |  |  | 8 | 1 | 23
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) |  |  | 269 |  |
Balance at End of Year | 4,507 | 4,575 | 4,507 | 4,575 | 6,058
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 | 64 | 83
Other Additions (Deductions) |  |  | 7 | (2) | 13
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction |  |  | (1) |  | (3)
SEC Schedule, 12-09, Valuation Allowance and Reserves, Deduction, Other |  |  | (2) | (4) | (29)
Balance at End of Year | $ 62 | $ 58 | 62 | $ 58 | $ 64
Foreign Tax Credits |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Valuation allowance, increase (decrease) |  |  | (305) |  |
Net Operating Losses |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Valuation allowance, increase (decrease) |  |  | $ (54) |  |

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