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Financing arrangements (Debt Exchange) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Notes [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount of notes issued $ 6,700   $ 4,500
Notes [Member] | 4.563% notes due 2048 (4.563% 2048 Notes) [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount of notes issued $ 1,400    
Interest rate, stated percentage 4.563% 4.563%  
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount of notes issued $ 3,500    
Interest rate, stated percentage 4.663% 4.663%  
Debt securities payable [Member] | New senior notes [Member] | Nonoperating Income (Expense) [Member]      
Debt Instrument [Line Items]      
Unamortized bond discounts and issuance costs $ 801    
Debt related commitment fees and debt issuance costs $ 24