Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recent Adopted Accounting Policies (Details)

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Summary of Significant Accounting Policies - Recent Adopted Accounting Policies (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease right-of-use assets $ 427 $ 466 $ 347 $ 0
Lease liabilities $ 467 $ 502    
Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease right-of-use assets     347  
Lease liabilities     $ 369