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Fair Value Measurements and Financial Instruments - Derivative Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative instruments entered during period $ 6,050 $ 10,168
Notional amount of derivative settled 4,018 9,488
Ineffective portion gain recognized in Interest expense 2 46
Cash received (paid) for settlement of derivative 107 764
Cross currency swaps | Cash Flow Hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative instruments entered during period 6,214 4,817
Notional amount of derivative settled 0 1,600
Pre-tax gain (loss) recognized in Other comprehensive loss (2,285) 1,810
Forward starting interest rate swaps | Cash Flow Hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative instruments entered during period 0 0
Notional amount of derivative settled 1,000 1,000
Pre-tax gain (loss) recognized in Other comprehensive loss 258 (486)
Cash received (paid) for settlement of derivative (237) (293)
Treasury rate locks | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative instruments entered during period 0 1,625
Notional amount of derivative settled 0 1,625
Pre-tax gain (loss) recognized in Other comprehensive loss 0 15
Treasury rate locks | Cash Flow Hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative instruments entered during period 4,650 5,500
Notional amount of derivative settled 4,650 5,500
Pre-tax gain (loss) recognized in Other comprehensive loss 251 (41)
Cash received (paid) for settlement of derivative 251 (41)
Foreign exchange forwards | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative instruments entered during period 12,604 14,030
Notional amount of derivative settled 13,077 13,755
Pre-tax gain (loss) recognized in Other comprehensive loss (62) 142
Swaption | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative settled 2,000 0
Notional value sold 2,000 0
Pre-tax gain (loss) recognized in Other comprehensive loss $ 11 $ 0