v3.19.3.a.u2
Fair Value Measurements And Disclosure (Fair Value Leveling) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities (at fair value) $ 1,444  
Securities Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities (at fair value) 1,444 $ 870
Securities Investment [Member] | United States [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 844 1,061
Securities Investment [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 183 256
Fixed Income Equities [Member] | United States [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 229 172
Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 2  
Liability Derivatives   (39)
Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 172 472
Liability Derivatives (3,187) (2,563)
Foreign Exchange Contracts [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 89 87
Liability Derivatives   (2)
Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 11  
Liability Derivatives (95)  
Level 1 [Member] | Securities Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities (at fair value) 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) 844 1,061
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) 183 256
Level 1 [Member] | Fixed Income Equities [Member] | United States [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities (at fair value) 229 172
Level 1 [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0  
Liability Derivatives   0
Level 1 [Member] | Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0 0
Liability Derivatives 0 0
Level 1 [Member] | Foreign Exchange Contracts [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0 0
Liability Derivatives   0
Level 1 [Member] | Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0  
Liability Derivatives 0  
Level 2 [Member] | Securities Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities (at fair value) 1,444 870
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 Equities [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] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 2  
Liability Derivatives   (39)
Level 2 [Member] | Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 172 472
Liability Derivatives (3,187) (2,563)
Level 2 [Member] | Foreign Exchange Contracts [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 89 87
Liability Derivatives   (2)
Level 2 [Member] | Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 11  
Liability Derivatives (95)  
Level 3 [Member] | Securities Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities (at fair value) 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 Equities [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] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0  
Liability Derivatives   0
Level 3 [Member] | Cross-Currency Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0 0
Liability Derivatives 0 0
Level 3 [Member] | Foreign Exchange Contracts [Member] | Non-US [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0 0
Liability Derivatives   $ 0
Level 3 [Member] | Interest Rate Locks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Derivatives 0  
Liability Derivatives $ 0