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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Fair Value Measurement) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale $ 1,947   $ 1,947   $ 3,623
Equity Securities, FV-NI 495   495   479
Debt Securities, Available-for-sale, Amortized Cost 1,945   1,945   3,660
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4   4   0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (2)   (2)   (37)
Total securities 2,442   2,442   4,102
Investments, Fair Value Disclosure 2,442   2,442   4,102
Debt Instrument, Face Amount 24,515   24,515   6,776
Equity Securities without Readily Determinable Fair Value, Amount 191   191   206
Equity Securities, FV-NI, Gain (Loss) 59 $ (374) 154 $ (359)  
Equity Securities, FV-NI, Realized Gain (Loss) 0 0 14 0  
Equity Securities, FV-NI, Unrealized Gain (Loss) 59 $ (374) 140 $ (359)  
Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and Cash Equivalents, Fair Value Disclosure 0   0   0
Derivative asset 0   0   0
Derivative Liability 0   0   0
Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and Cash Equivalents, Fair Value Disclosure 27,797   27,797   6,173
Derivative asset 46   46   44
Derivative Liability (255)   (255)   (31)
Certificates of Deposit [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 166   166   971
Debt Securities, Available-for-sale, Amortized Cost 166   166   971
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0   0   0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 0   0   0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 166   166   971
Commercial Paper [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 30   30   273
Debt Securities, Available-for-sale, Amortized Cost 30   30   273
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0   0   0
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 0   0   0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 30   30   273
Corporate Debt Securities [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 1,751   1,751   2,379
Debt Securities, Available-for-sale, Amortized Cost 1,749   1,749   2,416
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4   4   0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (2)   (2)   (37)
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 0   0   0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Securities, Available-for-sale 1,751   1,751   2,379
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities, FV-NI 0   0   0
Marketable Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities, FV-NI 0   0   125
Other Current Assets [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments, Fair Value Disclosure 953   953   1,973
Other Investments [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments, Fair Value Disclosure 994   994   1,775
Other Assets [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments, Fair Value Disclosure 495   495   354
Other Assets [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities, FV-NI 207   207   88
Other Assets [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities, FV-NI 288   288   266
Portion at Other than Fair Value Measurement [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Method Investments 142   142   $ 114
$19 Billion Senior Unsecured Notes [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Instrument, Face Amount $ 19,000   $ 19,000