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Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Long term debt | $ 14,733 | $ 13,636 |
Less: unamortized debt discount, premiums and debt issuance costs | (181) | (191) |
Less: current portion of long-term debt | (1,407) | (1,230) | [1]
Long-term debt, net | $ 13,145 | 12,215 | [1]
6% Senior Notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 6.00% |  |
4.25% Senior Notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 4.25% |  |
5% Senior Notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 5.00% |  |
4.875% Senior Notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 4.25% |  |
Secured Debt | Notes payable, fixed interest rates of 2.7% to 9.8% (weighted average rate of 3.95% as of December 31, 2019), payable through 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 9,615 | 8,811 |
Weighted average rate | 3.95% |  |
Secured Debt | Notes payable, fixed interest rates of 2.7% to 9.8% (weighted average rate of 3.95% as of December 31, 2019), payable through 2032 | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 2.70% |  |
Secured Debt | Notes payable, fixed interest rates of 2.7% to 9.8% (weighted average rate of 3.95% as of December 31, 2019), payable through 2032 | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 9.80% |  |
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate (LIBOR) plus 1.05% to 2.25%, payable through 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 1,970 | 2,051 |
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate (LIBOR) plus 1.05% to 2.25%, payable through 2030 | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.05% |  |
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate (LIBOR) plus 1.05% to 2.25%, payable through 2030 | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 2.25% |  |
Secured Debt | Term loan, LIBOR plus 1.75%, or alternative rate based on certain market rates plus 0.75%, due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 1,459 | 1,474 |
Secured Debt | Term loan, LIBOR plus 1.75%, or alternative rate based on certain market rates plus 0.75%, due 2024 | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.75% |  |
Secured Debt | Term loan, LIBOR plus 1.75%, or alternative rate based on certain market rates plus 0.75%, due 2024 | Alternative Rate Based on Certain Market Interest Rates |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.75% |  |
Unsecured Debt | 6% Senior Notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 300 | 300 |
Fixed interest rate | 6.00% |  |
Unsecured Debt | 4.25% Senior Notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 400 | 400 |
Fixed interest rate | 4.25% |  |
Unsecured Debt | 5% Senior Notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 300 | 300 |
Fixed interest rate | 5.00% |  |
Unsecured Debt | 4.875% Senior Notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 350 | 0 |
Fixed interest rate | 4.875% |  |
Unsecured Debt | Other |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 339 | $ 300 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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