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Treasury - Additional Information (Detail) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 26, 2018 USD ($) | Oct. 23, 2018 USD ($) | Jun. 07, 2016 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2015 USD ($) Derivative | Dec. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jun. 03, 2016 USD ($) | Aug. 07, 2014 USD ($)
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, starting date |  |  |  | Oct. 23, 2018 |  |  |  |  |  |  |  |
Rate adjustment to weighted average federal funds rate for credit facility borrowings |  |  |  | 0.50% |  |  |  |  |  |  |  |
Rate adjustment to one month Eurodollar rate on credit facility borrowings |  |  |  | 1.00% |  |  |  |  |  |  |  |
Accounts receivable securitization program credit facility, borrowing capacity |  |  |  |  |  |  |  |  | $ 440,000,000 | $ 450,000,000 |  |
Accounts receivable securitization program credit facility, amount outstanding |  |  |  | $ 260,000,000 |  |  |  |  |  |  |  |
Accounts receivable securitization program credit facility, available borrowing capacity |  |  |  | 190,000,000 |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  |  | 3,800,000,000 |  |  | $ 4,000,000,000.0 |  |  |  |  |
Fair value of debt |  |  |  | 3,800,000,000 |  |  | $ 4,000,000,000.0 |  |  |  |  |
One Point Three One Percent Forward Starting Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of additional forward starting interest rate swaps | Derivative |  |  |  |  |  | 9 |  |  |  |  |  |
Maturity date of interest rate cash flow hedges |  |  |  |  |  | Apr. 15, 2019 |  |  |  |  |  |
Fixed rate payable on interest rate swap |  |  |  |  |  | 1.31% |  |  |  |  |  |
Foreign Currency Forward Exchange Contracts |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net cash (outflows) inflows |  |  |  | $ 52,000,000 | $ 28,000,000 |  |  |  |  |  |  |
Cash Flow Hedging | One Point Three One Percent Forward Starting Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate cash flow hedges |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |
Tranche B Term Loan | One Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 0.75% |  |  |  |  |  |  |  |
Tranche B Term Loan | One Two Three Six Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 1.75% |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  | $ 1,000,000,000 | $ 800,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility increased amount |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Oct. 23, 2023 | Aug. 07, 2019 |  |  |  |  |  |  |  |  |
Line of credit facility, available borrowing capacity |  |  |  | $ 998,000,000 |  |  |  |  |  |  |  |
Line of credit facility amount outstanding |  | $ 1,000,000,000 |  | $ 0 |  |  |  |  |  |  |  |
Current applicable margins |  |  |  | 1.375% |  |  |  |  |  |  |  |
Revolving Credit Facility | ABR-based loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current applicable margins |  |  |  | 1.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | One Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 0.375% |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | One Two Three Six Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 1.375% |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | One Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 0.625% |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | One Two Three Six Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 1.625% |  |  |  |  |  |  |  |
Revolving Credit Facility | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |
Letters of credit, outstanding |  |  |  | 2,000,000 |  |  |  |  |  |  |  |
Tranche A Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  | 2,000,000,000 | $ 1,710,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility increased amount |  | $ 290,000,000 |  |  |  |  |  |  |  |  |  |
Senior notes, maturity date |  | Oct. 23, 2023 | Aug. 07, 2019 |  |  |  |  |  |  |  |  |
Line of credit facility amount outstanding |  |  |  | $ 1,938,000,000 |  |  |  |  |  |  |  |
Tranche A Term Loan | Quarterly Payment for First Eight Installments |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Scheduled principal payments per quarter |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |
Debt instrument payment, description |  |  |  | commenced in March of 2019 and are scheduled to continue through December of 2020 |  |  |  |  |  |  |  |
Tranche A Term Loan | Quarterly Payment after Eight Installments Until Maturity |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Scheduled principal payments per quarter |  | 25,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument payment, description |  |  |  | commencing in March of 2021 until maturity in October of 2023 |  |  |  |  |  |  |  |
Tranche B Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Senior notes, maturity date |  |  |  | Oct. 31, 2025 |  |  |  |  |  |  |  |
Line of credit facility amount outstanding |  |  |  | $ 494,000,000 |  |  |  |  |  |  |  |
Scheduled principal payments per quarter |  | $ 1,250,000 |  |  |  |  |  |  |  |  |  |
Debt instrument payment, description |  |  |  | commenced on March 31, 2019 and are scheduled to continue until maturity in October of 2025 |  |  |  |  |  |  |  |
New Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, issued |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |
New Senior Secured Notes | 3.75% Senior Secured Notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |
Senior notes, interest rate |  |  |  |  |  |  |  | 3.75% |  |  |  | 3.75%
Senior notes, issued | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage | 100.485% |  |  |  |  |  |  |  |  |  |  |
Redemption premium paid | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
New Senior Secured Notes | 4.75% Senior Secured Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, maturity date |  |  |  | Aug. 01, 2022 |  |  |  |  |  |  |  |
Senior notes, interest rate |  |  |  | 4.75% |  |  |  |  |  |  |  |
Senior notes, issued |  |  |  | $ 700,000,000 |  |  |  |  |  |  | $ 400,000,000 | $ 300,000,000
Senior notes issued percentage |  |  |  |  |  |  |  |  |  |  | 101.50% |
Senior notes yield percentage |  |  |  |  |  |  |  |  |  |  | 4.35% |
New Senior Secured Notes | 5.00% Senior Secured Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, maturity date |  |  |  | Jun. 01, 2026 |  |  |  |  |  |  |  |
Senior notes, interest rate |  |  |  |  |  |  |  |  |  |  | 5.00% |
Senior notes, issued |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |
Term Loan A |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current applicable margins |  |  |  | 1.375% |  |  |  |  |  |  |  |
Term Loan A | ABR-based loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current applicable margins |  |  |  | 0.375% |  |  |  |  |  |  |  |
Term Loan A | Minimum | One Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 0.375% |  |  |  |  |  |  |  |
Term Loan A | Minimum | One Two Three Six Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 1.375% |  |  |  |  |  |  |  |
Term Loan A | Maximum | One Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 0.625% |  |  |  |  |  |  |  |
Term Loan A | Maximum | One Two Three Six Month LIBOR Rate Plus Index Based Loans |  |  |  |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  |  | 1.625% |  |  |  |  |  |  |  |

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