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DEBT - Senior Notes (Details) - Senior Notes (Unsecured) - USD ($)
1 Months Ended
Oct. 31, 2014
Oct. 31, 2020
Debt Instrument [Line Items]    
Aggregate principal amount issued $ 5,000,000,000  
Proceeds from issuance of debt 4,950,000,000  
5% Senior Notes due 2020    
Debt Instrument [Line Items]    
Aggregate principal amount issued $ 1,000,000,000  
Interest rate 5.00%  
5.5% Senior Notes due 2021    
Debt Instrument [Line Items]    
Aggregate principal amount issued $ 1,750,000,000  
Interest rate 5.50% 0.055%
6% Senior Notes due 2024    
Debt Instrument [Line Items]    
Aggregate principal amount issued $ 2,250,000,000  
Interest rate 6.00% 6.00%