SHARE-BASED COMPENSATION PLANS (Details - Share-settled Awards - Outstanding share-settled awards) $ / shares in Units, $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2020 USD ($) item	Jun. 30, 2020 item	Sep. 30, 2019	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Maximum
Total unrecognized compensation cost (net of expected forfeitures) and the weighted-average periods over which those costs are expected to be recognized
Weighted-Average Period				5 years
RSUs
Change in number of shares
Unvested, beginning of year (in shares) | shares				1,231,185	1,634,610	595,250
Granted (in shares) | shares				583,068	399,779	1,385,929
Vested (in shares) | shares				(535,220)	(774,350)	(342,481)
Forfeited (in shares) | shares				(127,653)	(28,854)	(4,088)
Unvested, end of year (in shares) | shares				1,151,380	1,231,185	1,634,610
Change in Weighted Average Grant-Date Fair Value
Unvested, beginning of year (in dollars per share) | $ / shares				$ 54.17	$ 56.11	$ 62.93
Granted (in dollars per share) | $ / shares				35.54	52.40	54.07
Vested (in dollars per share) | $ / shares				50.89	57.32	59.68
Forfeited (in dollars per share) | $ / shares				54.90	55.23	60.31
Unvested, end of year (in dollars per share) | $ / shares				$ 46.18	$ 54.17	$ 56.11
RSUs | Maximum
Total unrecognized compensation cost (net of expected forfeitures) and the weighted-average periods over which those costs are expected to be recognized
Weighted-Average Period				3 years
LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified cap payout percent			100.00%
Performance period			3 years
Net credit to compensation expense | $	$ 4
2016 LTI | PSUs
Change in number of shares
Unvested, beginning of year (in shares) | shares				223,364
Granted (in shares) | shares				0
Vested (in shares) | shares				(203,533)
Forfeited (in shares) | shares				(19,831)
Unvested, end of year (in shares) | shares				0	223,364
Change in Weighted Average Grant-Date Fair Value
Unvested, beginning of year (in dollars per share) | $ / shares				$ 62.14
Granted (in dollars per share) | $ / shares				0
Vested (in dollars per share) | $ / shares				62.14
Forfeited (in dollars per share) | $ / shares				62.13
Unvested, end of year (in dollars per share) | $ / shares				$ 0	$ 62.14
2018 LTI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance goal metrics | item	2	3
2018 LTI | PSUs
Change in number of shares
Unvested, beginning of year (in shares) | shares				2,656,994
Granted (in shares) | shares				79,294
Vested (in shares) | shares				(2,338,209)
Forfeited (in shares) | shares				(398,079)
Unvested, end of year (in shares) | shares				0	2,656,994
Change in Weighted Average Grant-Date Fair Value
Unvested, beginning of year (in dollars per share) | $ / shares				$ 55.21
Granted (in dollars per share) | $ / shares				28.16
Vested (in dollars per share) | $ / shares				55.35
Forfeited (in dollars per share) | $ / shares				54.92
Unvested, end of year (in dollars per share) | $ / shares				$ 0	$ 55.21
2019 LTI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance goal metrics | item	2	3
2019 LTI | PSUs
Change in number of shares
Unvested, beginning of year (in shares) | shares				4,523,898
Granted (in shares) | shares				109,479
Vested (in shares) | shares				(599,606)
Forfeited (in shares) | shares				(536,352)
Unvested, end of year (in shares) | shares				3,497,419	4,523,898
Change in Weighted Average Grant-Date Fair Value
Unvested, beginning of year (in dollars per share) | $ / shares				$ 44.98
Granted (in dollars per share) | $ / shares				28.16
Vested (in dollars per share) | $ / shares				45.14
Forfeited (in dollars per share) | $ / shares				44.55
Unvested, end of year (in dollars per share) | $ / shares				$ 44.79	$ 44.98
2020 LTI | PSUs
Change in number of shares
Unvested, beginning of year (in shares) | shares				0
Granted (in shares) | shares				7,281,247
Vested (in shares) | shares				(1,788,974)
Forfeited (in shares) | shares				(143,617)
Unvested, end of year (in shares) | shares				5,348,656	0
Change in Weighted Average Grant-Date Fair Value
Unvested, beginning of year (in dollars per share) | $ / shares				$ 0
Granted (in dollars per share) | $ / shares				31.37
Vested (in dollars per share) | $ / shares				31.46
Forfeited (in dollars per share) | $ / shares				32.00
Unvested, end of year (in dollars per share) | $ / shares				$ 31.33	$ 0
Total unrecognized compensation cost (net of expected forfeitures) and the weighted-average periods over which those costs are expected to be recognized
Unrecognized Compensation Cost | $				$ 178
Weighted-Average Period				11 months 8 days
Expected Period				2 years