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Fair Value Measurements and Financial Instruments - Carrying Value and Estimated Fair Value of Long-term Debt (Details) - Long-term Debt - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Carrying amount of hedged item $ 407 $ 413
Cumulative hedging adjustment included in the carrying amount $ 8 $ 14