Debt - Schedule of Long-term Debt (Details) € in Millions | Mar. 31, 2021USD ($) | Dec. 31, 2020USD ($) | Dec. 31, 2020EUR (€) |
Debt Instrument [Line Items] | | | |
Total debt, principal balance | $ 5,395,000,000 | $ 6,858,000,000 | |
Short-term debt and current maturities of long-term debt, principal balance | 88,000,000 | 1,343,000,000 | |
Long-term debt excluding current maturities, principal balance | 5,307,000,000 | 5,515,000,000 | |
Long-term debt, carrying value | 5,162,000,000 | 5,369,000,000 | |
Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | 5,162,000,000 | 5,369,000,000 | |
Total debt, carrying value | 5,250,000,000 | 6,707,000,000 | |
Short-term debt and current maturities of long-term debt, carrying value | 88,000,000 | 1,338,000,000 | |
Term loan facilities | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | 2,003,000,000 | 2,003,000,000 | |
Term loan facilities | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | 1,971,000,000 | 1,974,000,000 | |
6.50% Senior notes due 2022 | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | $ 0 | 1,200,000,000 | |
Stated interest rate | 6.50% | | |
6.50% Senior notes due 2022 | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | $ 0 | 1,195,000,000 | |
6.125% Senior notes due 2023 | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | $ 535,000,000 | 535,000,000 | |
Stated interest rate | 6.125% | | |
6.125% Senior notes due 2023 | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | $ 532,000,000 | 531,000,000 | |
6.75% Senior notes due 2024 | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | $ 1,000,000,000 | 1,000,000,000 | |
Stated interest rate | 6.75% | | |
6.75% Senior notes due 2024 | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | $ 990,000,000 | 989,000,000 | |
6.25% Senior notes due 2025 | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | $ 1,150,000,000 | 1,150,000,000 | |
Stated interest rate | 6.25% | | |
6.25% Senior notes due 2025 | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | $ 1,139,000,000 | 1,138,000,000 | |
6.70% Senior debentures due 2034 | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | $ 300,000,000 | 300,000,000 | |
Stated interest rate | 6.70% | | |
6.70% Senior debentures due 2034 | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | $ 211,000,000 | 210,000,000 | |
Finance leases, asset financing and other | | | |
Debt Instrument [Line Items] | | | |
Finance leases, asset financing and other | 407,000,000 | 420,000,000 | |
Finance leases, asset financing and other | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Finance leases, asset financing and other | 407,000,000 | 420,000,000 | |
ABL facility | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | 0 | 200,000,000 | |
ABL facility | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | 0 | 200,000,000 | |
Borrowings related to securitization program | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, principal balance | 0 | 50,000,000 | |
Borrowings related to securitization program | Carrying Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, carrying value | $ 0 | $ 50,000,000 | € 41 |