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Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Supplemental Cash Flow Disclosure (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]        
Cash and cash equivalents $ 1,769 $ 1,040    
Restricted cash and cash equivalents 309 212    
Restricted Cash and Cash Equivalents, Noncurrent 18 16    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 2,096 $ 1,268 $ 1,406 $ 883