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Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Derivative assets $ 940 $ 942
Derivative liabilities 352 415
Potential reduction in net position of total derivative assets 272 255
Fair value assets, Level 2 to Level 1 transfer 0 0
Fair value assets, Level 1 to Level 2 transfer 0 0
Fair value liabilities, Level 2 to Level 1 transfer 0 0
Fair value liabilities, Level 1 to Level 2 transfer 0 0
Recurring    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents 8,348 8,586
Equity investments - new guidance 4  
Equity investments - prior year guidance   4
Debt securities - current 893 608
Debt securities - noncurrent   11
Derivative assets 940 942
Total assets 10,185 10,151
Derivative liabilities 352 415
Potential reduction in net position of total derivative assets 272 255
Potential reduction in net position of total derivative liabilities 272 255
Recurring | Prepaid expenses and other current assets    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Derivative assets 118 185
Recurring | Investments and sundry assets    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Derivative assets 822 757
Recurring | Other accrued expenses and liabilities    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Derivative liabilities 273 377
Recurring | Other liabilities    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Derivative liabilities 79 38
Recurring | Time deposits and certificates of deposit    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents 8,323 8,066
Recurring | Commercial paper    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents   96
Recurring | Money market funds    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents 25 26
Recurring | Canadian government securities    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents   398
Recurring | Level 1    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents 25 26
Equity investments - new guidance 4  
Equity investments - prior year guidance   4
Debt securities - noncurrent   4
Total assets 29 33
Recurring | Level 1 | Money market funds    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents 25 26
Recurring | Level 2    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents 8,323 8,560
Debt securities - current 893 608
Debt securities - noncurrent   7
Derivative assets 940 942
Total assets 10,156 10,117
Derivative liabilities 352 415
Recurring | Level 2 | Time deposits and certificates of deposit    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents $ 8,323 8,066
Recurring | Level 2 | Commercial paper    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents   96
Recurring | Level 2 | Canadian government securities    
Financial assets and financial liabilities measured at fair value on a recurring basis:    
Cash equivalents   $ 398