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Leases and Commitments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Leases and Commitments    
Lessee Operating Leases Remaining Contractual Terms 97 years  
Operating Leases, Options To Extend Lease Terms 99  
Operating, Options To Terminate Lease Term 1  
Operating Lease, Weighted Average Remaining Lease Term 5 years  
Operating Lease, Weighted Average Discount Rate, Percent 3.00%  
Long-Term Contracts, Purchase Obligations Due in 2020 $ 1,530  
Long-Term Contracts, Purchase Obligations Due in 2022 96  
Long-Term Contracts, Purchase Obligations Due in 2023 94  
Long-Term Contracts, Purchase Obligations Due in 2024 34  
Long-Term Contracts, Purchase Obligations Due Beyond 2024 56  
Long-Term Contracts, Purchase Obligations Due in 2021 729  
Finance Lease, Right-of-Use Asset, Accumulated Amortization $ 27 $ 14
Finance Lease, Weighted Average Remaining Lease Term 9 years  
Finance Lease, Weighted Average Discount Rate, Percent 3.00%