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Accounting Standards Updates (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2019
Recently issued accounting standards    
Lease, Practical Expedients, Package [true false] true  
Finance Lease, Liability   $ 479
Finance lease current   35
Finance lease noncurrent   444
Operating lease liability   129
Operating leases current   13
Operating leases noncurrent   $ 116
ASU-Leases | Reclassifications    
Recently issued accounting standards    
Right-to-use asset, Finance lease $ 528  
Finance Lease, Liability 511  
Finance lease current 32  
Finance lease noncurrent 479  
Right-to-use asset, Operating lease 95  
Operating lease liability 133  
Operating leases current 15  
Operating leases noncurrent 118  
ASU-Reclassification of certain tax effects | Reclassifications    
Recently issued accounting standards    
Effect of adopting accounting standards update $ 24