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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Decrease associated with reduction in corporate income Tax Reform | $ 1,100 |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Reversal of valuation allowance for minimum tax credit carryforwords due to Tax Reform | 371 |  |
Valuation allowance for deferred tax assets |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Deductions | (1,484) |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 6,058 | $ 4,183 | $ 2,434
Additions Charged to Cost and Expense |  | 1,852 | 1,749
Additons Charged to Other Accounts | 1 | 23 | 0
Other Additions (Deductions) | 0 | 0 | 0
Balance at End of Year | 4,575 | 6,058 | 4,183
Reserve for Taxes, Other than Income Taxes [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Deductions | (2) | (3) |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 64 | 83 | 93
Additions Charged to Cost and Expense |  | 13 | 9
Additons Charged to Other Accounts | 0 |  | 0
Other Additions (Deductions) | (4) | (29) | (19)
Balance at End of Year | $ 58 | $ 64 | $ 83

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- Definition Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Deferred Tax Asset Valuation Allowance + References No definition available. + Details
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- Definition Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Tax Credit Carryforwards, Alternative Minimum Tax + References No definition available. + Details
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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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