Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

v3.19.1
Summary of Significant Accounting Policies (Details) - Accounting Standards Update 2016-02
$ in Millions
Jan. 01, 2019
USD ($)
Operating Lease, Right-of-use Assets  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Effect of new accounting principle $ 11
Operating Lease, Right-of-use Assets | Properties  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Effect of new accounting principle 16
Operating Lease Liability | Properties  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Effect of new accounting principle 16
Finance Lease, Right-of Use Assets | Properties  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Effect of new accounting principle 38
Total Properties, Net  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Effect of new accounting principle $ (38)