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Marketable Securities (current and non-current) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable Securities |  |
Current marketable securities | $ 604 | $ 1,076
Non-current marketable securities | 27 | 27
Total marketable securities | 631 | 1,103
Corporate debt securities |  |
Marketable Securities |  |
Current marketable securities | 20 | 14
Commercial paper |  |
Marketable Securities |  |
Current marketable securities | 495 | 899
Certificates of deposit/time deposits |  |
Marketable Securities |  |
Current marketable securities | 59 | 76
U.S. municipal securities |  |
Marketable Securities |  |
Current marketable securities | 3 | 3
Non-current marketable securities | 27 | 27
Asset-backed securities total |  |
Marketable Securities |  |
Current marketable securities | 27 | 84
Asset-backed securities Automobile loan related |  |
Marketable Securities |  |
Current marketable securities | 8 | 16
Asset-backed securities Credit card related |  |
Marketable Securities |  |
Current marketable securities | $ 19 | $ 68

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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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