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Significant Accounting Policies - Reclassifications (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2019
Significant Accounting Policies    
Recognition of lease liability $ 214  
Operating lease right-of-use assets (included in Other assets) $ 214 $ 203
Lease, Practical Expedients, Package [true false] true  
Lease, Practical Expedient, Land Easement [true false] true  
Lease, Practical Expedient, Use of Hindsight [true false] false