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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Treasury rate lock contracts    
Derivatives in Cash Flow Hedging Relationships    
Derivative notional amount   $ 500
Cash flow hedge    
Derivatives in Cash Flow Hedging Relationships    
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges $ (20)  
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the income statement within next twelve months 56  
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement over remaining fiscal year 31  
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement over next fiscal year 37  
After-tax unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement after the next fiscal year $ (88)  
Cash flow hedge | Foreign currency forward/option contracts    
Derivatives in Cash Flow Hedging Relationships    
Maximum length of time hedged in interest rate cash flow hedge 36 months  
Cash flow hedge | Interest rate contracts    
Derivatives in Cash Flow Hedging Relationships    
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges $ (111)