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Significant Accounting Policies - New Accounting Pronouncements (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | $ 1,637 | $ 3,317 | $ 3,386 |
Consolidated Statements of Cash Flows |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to other suppliers and employees |  |  |  |  |  |  |  |  | (15,348) | (15,478) | (14,035) |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 8,007 | 10,141 | 8,539 |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (6,751) | (6,761) | 4,879 |
Reconciliation of net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  |  |  |  | (371) | 131 | 892 |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 19,028 | 18,491 | 17,053 |
Operating profit | $ 3,108 | $ 2,499 | $ 2,117 | $ 1,793 | $ 3,000 | $ 2,824 | $ 2,357 | $ 2,185 | 9,517 | 10,366 | 9,475 |
Other expense |  |  |  |  |  |  |  |  | 208 | 28 | 21 |
ASU 2016-09 | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | $ (53) |  |  |
Consolidated Statements of Cash Flows |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to other suppliers and employees |  |  |  |  |  |  |  |  |  | (15,550) | (14,162) |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 10,069 | 8,412 |
Excess tax benefits from stock-based compensation |  |  |  |  |  |  |  |  |  | 72 | 127 |
Net cash used in financing activities |  |  |  |  |  |  |  |  |  | (6,689) | 5,006 |
Reconciliation of net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  |  |  |  |  | 59 | 765 |
ASU 2016-09 | Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Cash Flows |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to other suppliers and employees |  |  |  |  |  |  |  |  |  | 72 | 127 |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 72 | 127 |
Excess tax benefits from stock-based compensation |  |  |  |  |  |  |  |  |  | (72) | (127) |
Net cash used in financing activities |  |  |  |  |  |  |  |  |  | (72) | (127) |
Reconciliation of net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  |  |  |  |  | 72 | 127 |
ASU 2017-07 | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 18,519 | 17,074 |
Operating profit |  |  |  |  |  |  |  |  |  | 10,338 | 9,454 |
ASU 2017-07 | Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | (28) | (21) |
Operating profit |  |  |  |  |  |  |  |  |  | 28 | 21 |
Other expense |  |  |  |  |  |  |  |  |  | $ 28 | $ 21 |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings adjustment |  |  |  |  |  |  |  |  |  |  |  | $ 13
ASU 2014-09 | Retail/LTC Segment |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Number of differences related to revenue accounting for ExtraBucks Rewards customer loyalty program | item |  |  |  |  |  |  |  |  | 1 |  |  |

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