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Leases and Commitments (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases and Commitments      
Lessee Operating Leases Remaining Contractual Terms 13 years    
Operating Leases, Options To Extend Lease Terms P20Y    
Operating, Options To Terminate Lease Term P1Y    
Operating Lease, Weighted Average Remaining Lease Term 4 years 4 months 24 days    
Operating Lease, Weighted Average Discount Rate, Percent 5.00%    
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities $ 163    
Lessee, Operating Lease, Not Yet Commenced, Pending Right-of-Use Asset and Liability $ 147    
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 9 years    
Consolidated rental expense   $ 280 $ 281
Long-Term Contracts, Purchase Obligations Due in 2020 $ 1,249    
Long-Term Contracts, Purchase Obligations Due in 2021 83    
Long-Term Contracts, Purchase Obligations Due in 2022 57    
Long-Term Contracts, Purchase Obligations Due in 2023 50    
Long-Term Contracts, Purchase Obligations Due in 2024 39    
Long-Term Contracts, Purchase Obligations Due Beyond 2024 $ 101