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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of the total gross unrecognized tax benefits |  |  |
Balance, January 1 | $ 120 | $ 92 | $ 91
Additions based on tax positions related to current year | 7 | 24 | 17
Unrecognized tax benefits, decrease resulting from prior period tax positions |  |  | (2)
Unrecognized tax benefits, increase resulting from prior period tax positions | 26 | 18 |
Reductions for closure of tax audits and settlements | 0 | (8) | (20)
Reductions for lapse in statute of limitations | (6) | 0 | (1)
Unrecognized tax benefits, increase resulting from foreign currency translation |  |  | 7
Unrecognized tax benefits, decrease resulting from foreign currency translation | (1) | (6) |
Balance, December 31 | 146 | 120 | $ 92
Income tax penalties and interest expense | 15 | 10 |
Unrecognized tax benefits that would impact effective tax rate | 144 |  |
Income tax penalties and interest accrued on unrecognized tax benefits | 46 | $ 32 |
Other Current Liabilities [Member] |  |  |
Reconciliation of the total gross unrecognized tax benefits |  |  |
Balance, December 31 | $ 5 |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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