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Customer Financing (Financing Receivable Credit Quality Indicators) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 33  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 92  
Financing Receivable, Originated Two Years before Latest Fiscal Year 17  
Financing Receivable, Originated Three Years before Latest Fiscal Year 311  
Financing Receivable, Originated Four Years before Latest Fiscal Year 194  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 807  
Carrying value of financing receivables 1,454 $ 1,472
Notes 452 $ 443
BBB Credit Rating    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated in Current Fiscal Year  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year  
Financing Receivable, Originated Two Years before Latest Fiscal Year  
Financing Receivable, Originated Three Years before Latest Fiscal Year  
Financing Receivable, Originated Four Years before Latest Fiscal Year  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 449  
Carrying value of financing receivables 449  
BB Credit Rating    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated in Current Fiscal Year 33  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 53  
Financing Receivable, Originated Two Years before Latest Fiscal Year 17  
Financing Receivable, Originated Three Years before Latest Fiscal Year  
Financing Receivable, Originated Four Years before Latest Fiscal Year  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 156  
Carrying value of financing receivables 259  
B Credit Rating    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated in Current Fiscal Year  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 38  
Financing Receivable, Originated Two Years before Latest Fiscal Year  
Financing Receivable, Originated Three Years before Latest Fiscal Year 106  
Financing Receivable, Originated Four Years before Latest Fiscal Year  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 188  
Carrying value of financing receivables 332  
CCC Credit Rating    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Originated in Current Fiscal Year  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 1  
Financing Receivable, Originated Two Years before Latest Fiscal Year  
Financing Receivable, Originated Three Years before Latest Fiscal Year 205  
Financing Receivable, Originated Four Years before Latest Fiscal Year 194  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 14  
Carrying value of financing receivables $ 414