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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities $ 705   $ 1,600
Total other noncurrent assets 4,450 $ 4,149 2,799
Total assets 167,489   159,422
Total liabilities 718   1,024
Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 11,176   20,110
Total liabilities 718   1,024
Government and agency debt - non-U.S. [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 4,863   9,703
Government and agency - U.S. [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 1,114   3,782
Corporate and Other [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 1,025   2,097
Level 1 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 1,863   1,260
Total liabilities 0   0
Level 2 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 9,313   18,850
Total liabilities 718   1,024
Short-term Investments [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 705   1,600
Available-for-sale securities, debt securities 6,687   15,091
Total short-term investments 7,392   16,691
Short-term Investments [Member] | Money market funds [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 705   1,571
Short-term Investments [Member] | Equity [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 0   29
Short-term Investments [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 4,863   9,609
Short-term Investments [Member] | Government and agency - U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 811   3,437
Short-term Investments [Member] | Corporate and Other [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 1,013   2,045
Short-term Investments [Member] | Level 1 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 0   17
Available-for-sale securities, debt securities 0   0
Total short-term investments 0   17
Short-term Investments [Member] | Level 1 [Member] | Money market funds [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 0   0
Short-term Investments [Member] | Level 1 [Member] | Equity [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 0   17
Short-term Investments [Member] | Level 1 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   0
Short-term Investments [Member] | Level 1 [Member] | Government and agency - U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   0
Short-term Investments [Member] | Level 1 [Member] | Corporate and Other [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   0
Short-term Investments [Member] | Level 2 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 705   1,583
Available-for-sale securities, debt securities 6,687   15,091
Total short-term investments 7,392   16,674
Short-term Investments [Member] | Level 2 [Member] | Money market funds [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 705   1,571
Short-term Investments [Member] | Level 2 [Member] | Equity [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 0   11
Short-term Investments [Member] | Level 2 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 4,863   9,609
Short-term Investments [Member] | Level 2 [Member] | Government and agency - U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 811   3,437
Short-term Investments [Member] | Level 2 [Member] | Corporate and Other [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 1,013   2,045
Other Current Assets [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 465   574
Other Current Assets [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 53   97
Other Current Assets [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 413   477
Other Current Assets [Member] | Level 1 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 0   0
Other Current Assets [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 0   0
Other Current Assets [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 0   0
Other Current Assets [Member] | Level 2 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 465   574
Other Current Assets [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 53   97
Other Current Assets [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative assets 413   477
Long-term Investments [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 1,902   1,273
Available-for-sale securities, debt securities 315   491
Total long-term investments 2,216   1,764
Long-term Investments [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   94
Long-term Investments [Member] | Government and agency - U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 303   345
Long-term Investments [Member] | Corporate and Other [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 11   52
Long-term Investments [Member] | Level 1 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 1,863   1,243
Available-for-sale securities, debt securities 0   0
Total long-term investments 1,863   1,243
Long-term Investments [Member] | Level 1 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   0
Long-term Investments [Member] | Level 1 [Member] | Government and agency - U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   0
Long-term Investments [Member] | Level 1 [Member] | Corporate and Other [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   0
Long-term Investments [Member] | Level 2 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 39   30
Available-for-sale securities, debt securities 315   491
Total long-term investments 354   521
Long-term Investments [Member] | Level 2 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 0   94
Long-term Investments [Member] | Level 2 [Member] | Government and agency - U.S. [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 303   345
Long-term Investments [Member] | Level 2 [Member] | Corporate and Other [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities, debt securities 11   52
Other Noncurrent Assets [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 526   566
Insurance contracts 575   515
Total other noncurrent assets 1,102   1,082
Other Noncurrent Assets [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 266   335
Other Noncurrent Assets [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 261   232
Other Noncurrent Assets [Member] | Level 1 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 0   0
Insurance contracts 0   0
Total other noncurrent assets 0   0
Other Noncurrent Assets [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 0   0
Other Noncurrent Assets [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 0   0
Other Noncurrent Assets [Member] | Level 2 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 526   566
Insurance contracts 575   515
Total other noncurrent assets 1,102   1,082
Other Noncurrent Assets [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 266   335
Other Noncurrent Assets [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative assets 261   232
Other Current Liabilities [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 114   82
Other Current Liabilities [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 0   5
Other Current Liabilities [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 114   78
Other Current Liabilities [Member] | Level 1 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 0   0
Other Current Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 0   0
Other Current Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 0   0
Other Current Liabilities [Member] | Level 2 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 114   82
Other Current Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 0   5
Other Current Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Current derivative liabilities 114   78
Other Noncurrent Liabilities [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 604   942
Other Noncurrent Liabilities [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 0   378
Other Noncurrent Liabilities [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 604   564
Other Noncurrent Liabilities [Member] | Level 1 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 0   0
Other Noncurrent Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 0   0
Other Noncurrent Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 0   0
Other Noncurrent Liabilities [Member] | Level 2 [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 604   942
Other Noncurrent Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities 0   378
Other Noncurrent Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Noncurrent derivative liabilities $ 604   $ 564