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Borrowings and Credit Arrangements (Details) € in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 21, 2020 USD ($) | Jan. 09, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 27, 2020 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 05, 2019 USD ($) | Aug. 19, 2019 USD ($) | Mar. 31, 2019 USD ($) | Feb. 25, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 19, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | $ 107 |  |  |  | $ 105 |  |  |  |  |  |
Total debt |  |  | 10,336 |  |  |  | 10,008 |  |  |  |  |  |
Restricted Cash and Cash Equivalents in Other current assets |  |  | 288 |  |  |  | 346 |  |  | $ 2,724 |  |  |
Long-term Debt and Capital Lease Obligations |  |  | 9,331 |  |  |  | 8,592 |  |  |  |  |  |
Debt, Current |  |  | 1,004 |  |  |  | 1,416 |  |  |  |  |  |
Exclusion from EBITDA for Restructuring Charges |  |  | 500 |  |  |  |  |  |  |  |  |  |
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA |  |  | 240 |  |  |  |  |  |  |  |  |  |
Litigation and Debt Exclusion from EBITDA |  |  | 2,624 |  |  |  |  |  |  |  |  |  |
Legal payments remaining to be excluded from calculation of consolidated EBITDA |  |  | 964 |  |  |  |  |  |  |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Paper |  |  | 0 |  |  |  | 711 |  |  |  |  |  |
Maximum Commercial Paper Outstanding with 2017 Facility |  |  | 2,750 |  |  |  | 2,750 |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 1,390 |  |  |  | $ 2,039 |  |  |  |  |  |
Weighted Average Maturity, Days |  |  | 0 days | 55 days |  |  |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  |  | 0.00% |  |  | 2.21% | 2.21% |  |  |  |  |  |
August 2019 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Current Requirement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 4.50 |  |  |  |  |  |  |  |  |  |
Current Requirement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 4.50 |  |  |  |  |  |  |  |  |  |
Requirement, first two quarters following qualified acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 4.75 |  |  |  |  |  |  |  |  |  |
Actual, Covenant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 4.10 |  |  |  |  |  |  |  |  |  |
Requirement, third quarter following qualified acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 4.50 |  |  |  |  |  |  |  |  |  |
Requirement, fourth quarter following qualified acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 4.25 |  |  |  |  |  |  |  |  |  |
Requirement, fifth quarter following qualified acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 4.00 |  |  |  |  |  |  |  |  |  |
Requirement, sixth quarter and thereafter following qualified acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio |  |  | 3.75 |  |  |  |  |  |  |  |  |  |
the 2018 Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | $ 1,360 |  | $ 1,360 |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 2,750 |  |  |  |  |  |  |  |  |  |
December 2020 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
February2019AggregateOffering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 4,300 |  |
January 2020 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.00% |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 850 |  |  |  |  |  |  |  |  |  |
May 2020 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.85% |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 600 |  |  |  |  |  |  |  |  |  |
November 2019 Aggregate Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  | € 900 | $ 1,000 |  |  |  |  |  |
May 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 500 |  |  |  | 500 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.375% |  |  |  |  |  |  |  |  |  |
October 2023 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 244 |  |  |  | 244 |  |  |  |  | $ 450 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.125% |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 206 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 1,360 |  |  |  |  |  |  |  |  |  |
March 2024 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 850 |  |  |  | 850 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.45% |  |  |  |  |  |  |  |  |  |
May 2025 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 523 |  |  |  | 523 |  |  |  |  | 750 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.85% |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | 227 |  |  |  |  |  |  |  |  |
March 2026 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 850 |  |  |  | 850 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.75% |  |  |  |  |  |  |  |  |  |
December 2027 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 988 |  |  |  | 1,011 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.625% |  |  |  |  |  |  |  |  |  |
March 2028 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 434 |  |  |  | 434 |  |  |  |  | $ 1,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 566 |  |  |  |  |  |  |  |  |
March 2029 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 850 |  |  |  | 850 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  |  |  |  |  |  |  |  |  |
November 2035 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 350 |  |  |  | 350 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.00% |  |  |  |  |  |  |  |  |  |
March 2039 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 750 |  |  |  | 750 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.55% |  |  |  |  |  |  |  |  |  |
January 2040 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 300 |  |  |  | 300 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.375% |  |  |  |  |  |  |  |  |  |
March 2049 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 1,000 |  |  |  | 1,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.70% |  |  |  |  |  |  |  |  |  |
Unamortized Gain on Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 7 |  |  |  | 7 |  |  |  |  |  |
Finance Lease Obligation |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 7 |  |  |  | 6 |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 7,638 |  |  |  | 7,661 |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  | (79) |  |  |  | (83) |  |  |  |  |  |
August 2022 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 0 |  |  |  | $ 1,000 |  |  |  |  |  |
2020 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 0.65% | 0.65% |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  | $ 700 | $ 700 |  |  |  |  |
Repayments of Debt |  | $ 300 |  |  |  |  |  |  |  |  |  |  |
February 2021 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.85% |  |  |  |  |  |  |  |  |  |
Short-term Debt |  |  | $ 1,000 |  | $ 1,000 |  |  |  |  |  |  |  |
Three-Year Delayed Draw Term Loan [Member] | Debt Instrument, Redemption, Period Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  | 1,000 |  | $ 1,000 |  |  |  | $ 1,000
Two-Year Delayed Draw Term Loan [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  | 1,000
Aggregate Senior Unsecured Delayed Draw Term Loan [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
Yen Denominated Factoring Arrangements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized |  |  | $ 197 |  |  |  | 226 |  |  |  |  |  |
Average interest rate of de-recognized receivables |  |  | 0.60% | 0.60% |  |  |  |  |  |  |  |  |
Euro Denominated Factoring Arrangements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized |  |  | $ 147 |  |  |  | $ 171 |  |  |  |  |  |
Average interest rate of de-recognized receivables |  |  | 1.90% | 1.40% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deemed Consolidated EBITDA | $ 671 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Requirement, extension through the remainder of 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio | 4.75 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | $400M Accordion Feature on April 2021 TL [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | April 2021 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.875% |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt | $ 1,250 |  |  |  |  |  |  |  |  |  |  |  |

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