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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.