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SUMMARY OF ACCOUNTING POLICIES - Cash Flows Impact (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 453 | $ 1,508 | $ 1,485 | $ 1,345 | $ 1,096 | $ 1,259 | $ 1,384 | $ 1,166 | $ 4,791 | $ 4,905 | $ 3,422
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred tax expense |  |  |  |  |  |  |  |  | 758 | 1,224 | 117
Other assets |  |  |  |  |  |  |  |  | 754 | (984) | 5
Accounts payable |  |  |  |  |  |  |  |  | 1,034 | 599 | 460
Accrued wages and withholdings |  |  |  |  |  |  |  |  | 505 | 200 | 91
Other liabilities |  |  |  |  |  |  |  |  | 170 | (243) | (546)
Other operating activities |  |  |  |  |  |  |  |  | 16 | 48 | (25)
Net cash from operating activities |  |  |  |  |  |  |  |  | 12,711 | 1,479 | 6,473
Purchases of marketable securities |  |  |  |  |  |  |  |  | (973) | (1,630) | (4,813)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (6,330) | (4,971) | (2,563)
Net Increase (Decrease) In Cash And Cash Equivalents |  |  |  |  |  |  |  |  | 598 | (152) | 749
Beginning of period |  |  |  | 3,769 |  |  |  | 3,921 | 3,769 | 3,921 | 3,172
End of period | $ 4,367 |  |  |  | 3,769 |  |  |  | 4,367 | 3,769 | 3,921
As previously reported |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  | 4,910 | 3,431
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred tax expense |  |  |  |  |  |  |  |  |  | 1,230 | 123
Other assets |  |  |  |  |  |  |  |  |  | (982) | (14)
Accounts payable |  |  |  |  |  |  |  |  |  | 592 | 461
Accrued wages and withholdings |  |  |  |  |  |  |  |  |  | 193 | 109
Other liabilities |  |  |  |  |  |  |  |  |  | (241) | (561)
Other operating activities |  |  |  |  |  |  |  |  |  | 47 |
Net cash from operating activities |  |  |  |  |  |  |  |  |  | 1,479 | 6,473
Purchases of marketable securities |  |  |  |  |  |  |  |  |  | (1,634) | (4,816)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (4,975) | (2,566)
Net Increase (Decrease) In Cash And Cash Equivalents |  |  |  |  |  |  |  |  |  | (156) | 746
Beginning of period |  |  |  | 3,320 |  |  |  | 3,476 | 3,320 | 3,476 | 2,730
End of period |  |  |  |  | 3,320 |  |  |  |  | 3,320 | 3,476
ASU 2014-09 | Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  | (5) | (9)
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred tax expense |  |  |  |  |  |  |  |  |  | (6) | (6)
Other assets |  |  |  |  |  |  |  |  |  | (2) | 19
Accounts payable |  |  |  |  |  |  |  |  |  | 7 | (1)
Accrued wages and withholdings |  |  |  |  |  |  |  |  |  | 7 | (18)
Other liabilities |  |  |  |  |  |  |  |  |  | (2) | 15
Other operating activities |  |  |  |  |  |  |  |  |  | 1 |
Accounting Standards Update 2016-18 [Member] | Adjustments |  |  |  |  |  |  |  |  |  |  |
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Purchases of marketable securities |  |  |  |  |  |  |  |  |  | 4 | 3
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | 4 | 3
Net Increase (Decrease) In Cash And Cash Equivalents |  |  |  |  |  |  |  |  |  | 4 | 3
Beginning of period |  |  |  | $ 449 |  |  |  | $ 445 | $ 449 | 445 | 442
End of period |  |  |  |  | $ 449 |  |  |  |  | $ 449 | $ 445

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