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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance as of beginning of year | $ 936 | $ 964 | $ 989
Additions based on tax positions related to the current year | 33 | 36 | 36
Additions for tax positions related to prior years | 15 | 11 | 83
Reductions for tax positions related to prior years | (42) | (46) | (82)
Reductions for tax positions related to the lapse of applicable statute of limitations | (1) | (3) | (3)
Settlements | 0 | (237) | (59)
Reclassification of uncertain tax receivable to long-term receivable from IRS | 0 | 211 | 0
Balance as of end of year | $ 941 | $ 936 | $ 964

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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