Quarterly report pursuant to Section 13 or 15(d)

RECENT ACCOUNTING PRONOUNCEMENTS - Cash Flow Impact (Details)

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RECENT ACCOUNTING PRONOUNCEMENTS - Cash Flow Impact (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net Income $ 1,345 $ 1,166
Deferred tax (benefit) expense 106 99
Other assets 1,100 383
Accounts payable (601) (673)
Accrued wages and withholdings (67) (34)
Other liabilities (24) (274)
Net cash from operating activities 4,067 239
Purchases of marketable securities (177) (509)
Net cash used in investing activities (1,446) (910)
Net decrease in cash, cash equivalents and restricted cash 57 (779)
Beginning of period 3,769 3,921
End of period $ 3,826 3,142
Previously Reported    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net Income   1,158
Deferred tax (benefit) expense   94
Other assets   397
Accounts payable   (675)
Accrued wages and withholdings   (35)
Other liabilities   (272)
Net cash from operating activities   239
Purchases of marketable securities   (519)
Net cash used in investing activities   (920)
Net decrease in cash, cash equivalents and restricted cash   (789)
Beginning of period   3,476
End of period   2,687
ASU 2014-09 | Restatement    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net Income   8
Deferred tax (benefit) expense   5
Other assets   (14)
Accounts payable   2
Accrued wages and withholdings   1
Other liabilities   (2)
Net cash from operating activities   0
Net cash used in investing activities   0
Net decrease in cash, cash equivalents and restricted cash   0
Beginning of period   0
End of period   0
ASU 2016-18 | Restatement    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net Income   0
Net cash from operating activities   0
Purchases of marketable securities   10
Net cash used in investing activities   10
Net decrease in cash, cash equivalents and restricted cash   10
Beginning of period   445
End of period   $ 455