Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies Other Details (Details)

v3.20.4
Summary of Significant Accounting Policies Other Details (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Cash Equivalents, at Carrying Value $ 240 $ 272  
Advertising Expense 208 153 $ 138
Cash and Cash Equivalents [Line Items]      
Cash Equivalents, at Carrying Value $ 240 $ 272  
CNR Home Shopping Co., Ltd.      
Accounting Policies [Abstract]      
Equity method investment, ownership percentage 49.00%    
Payments to Acquire Interest in Subsidiaries and Affiliates $ 10   40
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 49.00%    
Payments to Acquire Interest in Subsidiaries and Affiliates $ 10   $ 40