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Fair Value Disclosures - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Carrying value $ 13,779 $ 12,224
Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Estimated fair value of long-term debt portfolio 14,274 $ 12,375
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 28  
Foreign currency movement 2  
Gains recognized in earnings 3  
Ending balance $ 33