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Financial Instruments (Derivative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 2,833 $ 4,217    
Restricted Cash and Cash Equivalents, Current 115 110    
Restricted Cash and Cash Equivalents, Noncurrent 164 128    
Total cash, cash equivalents, restricted cash and restricted cash equivalents presented in the consolidated statements of cash flows 3,112 4,455 $ 3,999 $ 4,710
Credit Derivative, Maximum Exposure, Undiscounted 93      
Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 1,500 $ 2,300