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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary of unrecognized income tax benefits |  |  |
Unrecognized tax benefits balance at beginning of year | $ 39 | $ 38 | $ 30
Additions for tax positions of current year | 11 | 7 | 8
Additions for tax positions of prior years | 3 | 2 | 1
Reductions for tax positions of prior years | (1) | (2) | (1)
Reductions for settlements of tax positions |  | (1) |
Reductions for lapses in statutes of limitations | (10) | (5) |
Unrecognized tax benefits balance at end of year | $ 42 | $ 39 | $ 38

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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=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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