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Supplemental Financial Information - Other Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Other Assets [Abstract]    
Derivative contracts $ 80 $ 95
Intangible assets 311 400
Finance lease receivable 50 61
Other 212 164
Other assets 653 720
Other Assets | Interest rate derivatives    
Other Assets [Abstract]    
Derivative contracts [1] $ 1 $ 0
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 9.