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Debt - Credit Facility, Senior Notes, and Loan Repricing (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 10, 2018 | Jun. 28, 2018 | Jun. 27, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 07, 2016
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 12 |  | $ 12 |
Write off of Deferred Debt Issuance Cost |  |  |  | 3 |  |  |
Repayments of Debt | $ 476 |  |  |  |  |  |
Redemption Premium | 95 |  |  |  |  |  |
Write Off Of Unamortized Discount And Deferred Debt Issuance Cost | $ 13 |  |  |  |  |  |
Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  | 100.00% |
Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  | 110.50% |
Debt Instrument, Redemption Percentage |  |  |  |  |  | 35.00% |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit Facility Leverage Terms Low |  |  |  |  |  | 225.00% |
Credit Facility Leverage Terms Foreign Subsidiary |  |  |  |  |  | 65.00% |
Credit Facility Subsidiary Leverage Terms Low after Sept 30, 2018 |  |  |  |  |  | 3.75 |
Term Loan A due 2021 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letter of credit sub-facility |  |  |  |  |  |  | $ 700
Term Loan B due 2023 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letter of credit sub-facility |  |  |  | $ 833 | $ 842 | $ 833 | 850
Debt Instrument, Interest Rate, Increase (Decrease) |  | (0.50%) |  |  |  |  |
Term Loan B due 2023 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.00% |  |  |  |
Term Loan B due 2023 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 750
Debt Instrument, Interest Rate, Increase (Decrease) |  |  |  | (0.50%) |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.75% | 2.25% |  |
Letter of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letter of credit sub-facility |  |  |  | $ 300 |  | 300 |
Senior Notes due 2024 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letter of credit sub-facility |  |  |  | $ 34 | $ 510 | $ 34 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 10.50% |  | 10.50% |
Term Loan A due 2022 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letter of credit sub-facility |  |  |  | $ 705 | $ 732 | $ 705 |
Debt Instrument, Interest Rate, Increase (Decrease) |  | (0.50%) |  |  |  |  |
Term Loan A due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.25% |  |  |  |
Term Loan A due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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