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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Marketable Securities. |
Schedule of marketable securities |
(Millions) |  | March 31, 2018 |  | December 31, 2017 |
Corporate debt securities |  | $ | 20 |  | $ | 14 |
Commercial paper |  |  | 495 |  |  | 899 |
Certificates of deposit/time deposits |  |  | 59 |  |  | 76 |
U.S. municipal securities |  |  | 3 |  |  | 3 |
Asset-backed securities: |  |  |  |  |  |  |
Automobile loan related |  |  | 8 |  |  | 16 |
Credit card related |  |  | 19 |  |  | 68 |
Asset-backed securities total |  |  | 27 |  |  | 84 |
Current marketable securities |  | $ | 604 |  | $ | 1,076 |
U.S. municipal securities |  | $ | 27 |  | $ | 27 |
Non-current marketable securities |  | $ | 27 |  | $ | 27 |
Total marketable securities |  | $ | 631 |  | $ | 1,103 |
Marketable securities by contractual maturity |
(Millions) |  | March 31, 2018 |
Due in one year or less |  | $ | 604 |
Due after one year through five years |  |  | 13 |
Due after five years through ten years |  |  | 14 |
Total marketable securities |  | $ | 631 |

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