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Debt and Financing Activities - Long-Term Debt Narrative (Details) - USD ($)
Dec. 03, 2020
Dec. 31, 2020
Dec. 01, 2020
Mar. 31, 2020
Debt Instrument [Line Items]        
Long-term debt   $ 7,244,000,000   $ 7,387,000,000
Current portion of long-term debt   $ 777,000,000   $ 1,052,000,000
0.90% Notes due December 3, 2025 | Term Loan        
Debt Instrument [Line Items]        
Interest rate on debt instrument (percent) 0.90% 0.90%    
Debt principal amount $ 500,000,000      
Proceeds from debt issuance $ 496,000,000      
Price as percentage of debt outstanding at which debt can be purchased 101.00%      
3.65% Notes due November 30, 2020 | Term Loan        
Debt Instrument [Line Items]        
Interest rate on debt instrument (percent)   3.65%    
Debt principal amount   $ 700,000,000    
4.75% Notes due March 1, 2021 | Term Loan        
Debt Instrument [Line Items]        
Interest rate on debt instrument (percent)   4.75% 4.75%  
Debt principal amount     $ 323,000,000