GUARANTOR FINANCIAL INFORMATION - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Guarantor Obligations [Line Items]
Cash from (used for) operating activities	$ (214)	$ 122
Cash from (used for) investing activities	19,086	3,490
Cash from (used for) financing activities	(7,919)	(3,735)
Effect of currency exchange rate changes on cash, cash equivalents and restricted cash	(256)	78
Increase (decrease) in cash, cash equivalents and restricted cash	10,697	(45)
Cash, cash equivalents and restricted cash at beginning of year	37,077	35,548
Cash, cash equivalents and restricted cash at March 31	47,774	35,503
Less cash, cash equivalents and restricted cash of discontinued operations at March 31	437	3,671
Cash, cash equivalents and restricted cash of continuing operations at March 31	47,338	31,832
Cash from (used for) operating activities – discontinued operations	(67)	(298)
Reportable Legal Entities \| Parent Company Guarantor
Guarantor Obligations [Line Items]
Cash from (used for) operating activities	2,339	(6,665)
Cash from (used for) investing activities	(584)	7,201
Cash from (used for) financing activities	15,117	(555)
Effect of currency exchange rate changes on cash, cash equivalents and restricted cash	0	0
Increase (decrease) in cash, cash equivalents and restricted cash	16,872	(20)
Cash, cash equivalents and restricted cash at beginning of year	10,591	9,561
Cash, cash equivalents and restricted cash at March 31	27,463	9,541
Less cash, cash equivalents and restricted cash of discontinued operations at March 31	0	0
Cash, cash equivalents and restricted cash of continuing operations at March 31	27,463	9,541
Cash from (used for) operating activities – discontinued operations		(2,984)
Reportable Legal Entities \| Subsidiary Issuer
Guarantor Obligations [Line Items]
Cash from (used for) operating activities	558	611
Cash from (used for) investing activities	(558)	(611)
Cash from (used for) financing activities	0	0
Effect of currency exchange rate changes on cash, cash equivalents and restricted cash	0	0
Increase (decrease) in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash at beginning of year	0	0
Cash, cash equivalents and restricted cash at March 31	0	0
Less cash, cash equivalents and restricted cash of discontinued operations at March 31	0	0
Cash, cash equivalents and restricted cash of continuing operations at March 31	0	0
Reportable Legal Entities \| Subsidiary Guarantor
Guarantor Obligations [Line Items]
Cash from (used for) operating activities	(819)	(1,063)
Cash from (used for) investing activities	14	(61)
Cash from (used for) financing activities	805	1,124
Effect of currency exchange rate changes on cash, cash equivalents and restricted cash	0	0
Increase (decrease) in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash at beginning of year	0	1
Cash, cash equivalents and restricted cash at March 31	0	0
Less cash, cash equivalents and restricted cash of discontinued operations at March 31	0	0
Cash, cash equivalents and restricted cash of continuing operations at March 31	0	0
Reportable Legal Entities \| Non- Guarantor Subsidiaries
Guarantor Obligations [Line Items]
Cash from (used for) operating activities	30,587	(22,734)
Cash from (used for) investing activities	(21,387)	48,313
Cash from (used for) financing activities	(15,188)	(26,436)
Effect of currency exchange rate changes on cash, cash equivalents and restricted cash	(256)	78
Increase (decrease) in cash, cash equivalents and restricted cash	(6,243)	(779)
Cash, cash equivalents and restricted cash at beginning of year	27,121	30,398
Cash, cash equivalents and restricted cash at March 31	20,878	29,620
Less cash, cash equivalents and restricted cash of discontinued operations at March 31	437	3,671
Cash, cash equivalents and restricted cash of continuing operations at March 31	20,441	25,949
Consolidating Adjustments
Guarantor Obligations [Line Items]
Cash from (used for) operating activities	(32,879)	29,973
Cash from (used for) investing activities	41,601	(51,352)
Cash from (used for) financing activities	(8,653)	22,133
Effect of currency exchange rate changes on cash, cash equivalents and restricted cash	0	0
Increase (decrease) in cash, cash equivalents and restricted cash	69	753
Cash, cash equivalents and restricted cash at beginning of year	(636)	(4,412)
Cash, cash equivalents and restricted cash at March 31	(567)	(3,658)
Less cash, cash equivalents and restricted cash of discontinued operations at March 31	0	0
Cash, cash equivalents and restricted cash of continuing operations at March 31	$ (567)	$ (3,658)

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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Assets Held-for-Sale

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Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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