v3.20.2
Fair Value Measurements And Disclosure (Fair Value Leveling) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities Debt Securities $ 1,522 $ 1,444
Securities Investment [Member] | United States [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 832 844
Securities Investment [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 141 183
Fixed Income Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 230 229
Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value)   2
Liability Derivatives (at fair value) (3)  
Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 67 172
Liability Derivatives (at fair value) (6,767) (3,187)
Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liability Derivatives (at fair value)   (95)
Foreign Exchange Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 14 89
Liability Derivatives (at fair value) (10)  
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities Debt Securities 0 0
Level 1 [Member] | Securities Investment [Member] | United States [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 832 844
Level 1 [Member] | Securities Investment [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 141 183
Level 1 [Member] | Fixed Income Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 230 229
Level 1 [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value)   0
Liability Derivatives (at fair value) 0  
Level 1 [Member] | Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 0 0
Liability Derivatives (at fair value) 0 0
Level 1 [Member] | Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liability Derivatives (at fair value)   0
Level 1 [Member] | Foreign Exchange Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 0 0
Liability Derivatives (at fair value) 0  
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities Debt Securities 1,522 1,444
Level 2 [Member] | Securities Investment [Member] | United States [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 0 0
Level 2 [Member] | Securities Investment [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 0 0
Level 2 [Member] | Fixed Income Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 0 0
Level 2 [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value)   2
Liability Derivatives (at fair value) (3)  
Level 2 [Member] | Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 67 172
Liability Derivatives (at fair value) (6,767) (3,187)
Level 2 [Member] | Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liability Derivatives (at fair value)   (95)
Level 2 [Member] | Foreign Exchange Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 14 89
Liability Derivatives (at fair value) (10)  
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities Debt Securities 0 0
Level 3 [Member] | Securities Investment [Member] | United States [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 0 0
Level 3 [Member] | Securities Investment [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 0 0
Level 3 [Member] | Fixed Income Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 0 0
Level 3 [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value)   0
Liability Derivatives (at fair value) 0  
Level 3 [Member] | Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 0 0
Liability Derivatives (at fair value) 0 0
Level 3 [Member] | Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liability Derivatives (at fair value)   0
Level 3 [Member] | Foreign Exchange Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives (at fair value) 0 $ 0
Liability Derivatives (at fair value) $ 0