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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Notes) | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] |
|  |  |  | Additions (Deductions) |  |  |  |
|  | Balance at |  | Charged to |  | Charged to |  | Other |  | Balance at
|  | Beginning of |  | Costs and |  | Other |  | Additions |  | End of
|  | Year |  | Expense |  | Accounts |  | (Deductions) |  | Year
Reserves and allowances deducted |  |  |  |  |  |  |  |  |  |
from asset accounts: |  |  |  |  |  |  |  |  |  |
Valuation allowance for deferred tax assets |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2017 |  | $ | 6,058 |  |  | $ | (1,484 | ) | a | $ | 1 |  | b | $ | — |  |  | $ | 4,575 |
Year Ended December 31, 2016 |  | 4,183 |  |  | 1,852 |  |  | 23 |  | b | — |  |  | 6,058 |
Year Ended December 31, 2015 |  | 2,434 |  |  | 1,749 |  |  | — |  |  | — |  |  | 4,183 |
Reserves for non-income taxes: |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2017 |  | $ | 64 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | (4 | ) | c | $ | 58 |
Year Ended December 31, 2016 |  | 83 |  |  | 13 |  |  | (3 | ) |  | (29 | ) | c | 64 |
Year Ended December 31, 2015 |  | 93 |  |  | 9 |  |  | — |  |  | (19 | ) | c | 83 |
a. | Relates to a $1.1 billion decrease associated with a reduction in the corporate income tax rate applicable to U.S. federal deferred tax assets and $371 million for the reversal of valuation allowances on U.S. federal alternative minimum tax credits.
b. | Relates to a valuation allowance for tax benefits primarily associated with actuarial losses for U.S. defined benefit plans included in other comprehensive loss.
c. | Represents amounts paid or adjustments to reserves based on revised estimates.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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