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Taxes - Tax Rate Reconciliation Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective income tax rate reconciliation, additional disclosures        
U.S. corporate tax rate   21.00% 21.00% 21.00%
Measurement period adjustments recognized related to U.S. tax reform   $ 0 $ 100 $ 2,000
Effective tax rate (as a percent)   (18.60%) 7.20% 23.00%
Intangible assets $ 3,400 $ 3,540 $ 592  
Increase (decrease) in tax provision from intra-entity sale of intellectual property and impact of U.S. tax reform $ (900)      
Tax benefit due to change in foreign tax law   $ 200