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Leases (Schedule of Additional Lease Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash outflows for lease liabilities:    
Operating cash flows, Finance lease $ 7 $ 7
Weighted average remaining lease term (years), Finance lease 6 years 7 years
Weighted average discount rate, Finance lease 4.20% 4.20%
Operating cash flows, Operating lease $ 15 $ 2
Investing cash flows, Operating lease 9 $ 8
Right-of-use assets obtained in exchange for new lease liabilities, Operating lease $ 7  
Weighted average remaining lease term (years), Operating lease 1 year 6 months 4 years 1 month 6 days
Weighted average discount rate, Operating lease 1.30% 2.90%