Debt (Schedule of Line of Credit Facilities) (Details) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 988
Syndicated Credit Facility $850 Million [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		850
Long-term Line of Credit	[1]	$ 21	$ 21
Line of Credit Facility, Interest Rate Description		Senior unsecured long-term debt rating
Credit Facility 100 Million [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Long-term Line of Credit	[1]	$ 70	75
Line of Credit Facility, Interest Rate Description		Fixed
Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[2]	$ 80
Long-term Line of Credit	[1],[2]	$ 80	100
Line of Credit Facility, Interest Rate Description	[2]	Fixed
Syndicated Credit Facility $500 Million [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500
Long-term Line of Credit	[1]	$ 376	210
Line of Credit Facility, Interest Rate Description		Debt rating and utilization %
Credit Facility $108 Million
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 108
Long-term Line of Credit	[1]	$ 108	107
Line of Credit Facility, Interest Rate Description		Fixed
Credit Facility 100 Million (2024)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Long-term Line of Credit	[1]	$ 51	51
Line of Credit Facility, Interest Rate Description		Fixed
Credit Facility 100 Million (August 2024)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Long-term Line of Credit	[1]	$ 40	$ 100
Line of Credit Facility, Interest Rate Description		Fixed

[1] Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

[2] Foreign currency denominated facility, amounts presented are in U.S. dollars.