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SUMMARY OF ACCOUNTING POLICIES - Cash Flows Impact (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ (106) | $ 1,750 | $ 1,685 | $ 1,111 | $ 453 | $ 1,508 | $ 1,485 | $ 1,345 | $ 4,440 | $ 4,791 | $ 4,905
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred tax (benefit) expense |  |  |  |  |  |  |  |  | 100 | 758 | 1,224
Other assets |  |  |  |  |  |  |  |  | 698 | 754 | (984)
Accounts payable |  |  |  |  |  |  |  |  | 419 | 1,034 | 599
Accrued wages and withholdings |  |  |  |  |  |  |  |  | (446) | 505 | 200
Other liabilities |  |  |  |  |  |  |  |  | 182 | 170 | (243)
Other operating activities |  |  |  |  |  |  |  |  | 20 | 16 | 48
Net cash from operating activities |  |  |  |  |  |  |  |  | 8,639 | 12,711 | 1,479
Purchases of marketable securities |  |  |  |  |  |  |  |  | (561) | (973) | (1,630)
Net cash (used in) investing activities |  |  |  |  |  |  |  |  | (6,061) | (6,330) | (4,971)
Net Increase (Decrease) In Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |  |  | 871 | 598 | (152)
Beginning of period |  |  |  | $ 4,367 |  |  |  | 3,769 | 4,367 | 3,769 | 3,921
End of period | $ 5,238 |  |  |  | $ 4,367 |  |  |  | $ 5,238 | 4,367 | 3,769
As previously reported |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  | 4,910
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 1,230
Other assets |  |  |  |  |  |  |  |  |  |  | (982)
Accounts payable |  |  |  |  |  |  |  |  |  |  | 592
Accrued wages and withholdings |  |  |  |  |  |  |  |  |  |  | 193
Other liabilities |  |  |  |  |  |  |  |  |  |  | (241)
Other operating activities |  |  |  |  |  |  |  |  |  |  | 47
Net cash from operating activities |  |  |  |  |  |  |  |  |  |  | 1,479
Purchases of marketable securities |  |  |  |  |  |  |  |  |  |  | (1,634)
Net cash (used in) investing activities |  |  |  |  |  |  |  |  |  |  | (4,975)
Net Increase (Decrease) In Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |  |  |  |  | (156)
Beginning of period |  |  |  |  |  |  |  | 3,320 |  | 3,320 | 3,476
End of period |  |  |  |  |  |  |  |  |  |  | 3,320
ASU 2014-09 | Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  | (5)
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | (6)
Other assets |  |  |  |  |  |  |  |  |  |  | (2)
Accounts payable |  |  |  |  |  |  |  |  |  |  | 7
Accrued wages and withholdings |  |  |  |  |  |  |  |  |  |  | 7
Other liabilities |  |  |  |  |  |  |  |  |  |  | (2)
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
Net cash (used in) investing activities |  |  |  |  |  |  |  |  |  |  | 4
Net Increase (Decrease) In Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |  |  |  |  | 4
Beginning of period |  |  |  |  |  |  |  | $ 449 |  | $ 449 | 445
End of period |  |  |  |  |  |  |  |  |  |  | $ 449

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