BASIS OF PRESENTATION - ASU Adoption (Details) - USD ($)
$ in Millions |
3 Months Ended |
|
|
Mar. 31, 2018 |
Mar. 31, 2017 |
Jan. 01, 2018 |
Dec. 31, 2017 |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Reduction in net operating revenues |
$ (4,699)
|
$ (4,813)
|
|
|
| Reclassification of accounts receivable, less allowance for doubtful accounts |
(2,519)
|
|
|
$ (2,616)
|
| Cumulative effect of accounting change |
0
|
56
|
|
|
| Provision for doubtful accounts |
0
|
383
|
|
|
| Accounts receivable, allowance for doubtful accounts |
|
|
|
$ 898
|
| AOCI |
|
|
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Cumulative effect of accounting change |
(43)
|
|
|
|
| Retained Earnings |
|
|
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Cumulative effect of accounting change |
43
|
$ 56
|
|
|
| Accounting Standards Update 2018-02 | AOCI |
|
|
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Cumulative effect of accounting change |
|
|
$ (36)
|
|
| Accounting Standards Update 2018-02 | Retained Earnings |
|
|
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Cumulative effect of accounting change |
|
|
36
|
|
| Accounting Standards Update 2016-01 | Retained Earnings |
|
|
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Cumulative effect of accounting change |
|
|
7
|
|
| Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |
|
|
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Reduction in net operating revenues |
347
|
|
|
|
| Reclassification of accounts receivable, less allowance for doubtful accounts |
600
|
|
171
|
|
| Contract assets |
|
|
$ 171
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |
|
|
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
|
|
|
|
| Provision for doubtful accounts |
347
|
|
|
|
| Accounts receivable, allowance for doubtful accounts |
$ 600
|
|
|
|