Debt (Estimated Fair Value of Significant Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt	$ 967	$ 17
Long-term debt	10,399	10,933
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt	965	17
Long-term debt	$ 9,434	$ 12,466