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Employee Benefit Plans U.S and International Subsidiary Savings Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
U.S. savings plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expense for the U.S. and International subsidiary savings plan | $ 22 | $ 21 | $ 19
International subsidiary savings plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expense for the U.S. and International subsidiary savings plan | $ 17 | $ 17 | $ 16

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |