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Financial Instruments - Recurring fair value measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 221 $ 150
Total assets 221 150
Derivative liability (248) (95)
Total liabilities (248) (95)
Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 221 150
Investment securities 376 393
Total assets 597 543
Derivative liability (248) (95)
Total liabilities (248) (95)
Fair value, measurements, recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Investment securities 66 81
Total assets 66 81
Derivative liability 0 0
Total liabilities 0 0
Fair value, measurements, recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 221 150
Investment securities 0 8
Total assets 221 158
Derivative liability (248) (95)
Total liabilities (248) (95)
Fair value, measurements, recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Investment securities 310 304
Total assets 310 304
Derivative liability 0 0
Total liabilities $ 0 $ 0