RETIREMENT BENEFIT PLANS - Benefit obligation and plan assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Change in projected benefit obligation:
Delphi Technologies acquisition		$ 75
Change in plan assets:
Delphi Technologies acquisition		75
Funded status	$ (216)	(477)
Amounts in the Consolidated Balance Sheets consist of:
Non-current liabilities	$ (290)	(576)
Amounts in accumulated other comprehensive loss consist of:
Weighted average discount rate	0.0053
Other postretirement employee benefits
Change in projected benefit obligation:
Projected benefit obligation, January 1	$ 65	81
Service cost	0	0	$ 0
Interest cost	1	2	3
Plan amendments	0	(12)
Settlement and curtailment	0	0
Actuarial (gain) loss	(6)	1
Currency translation	0	0
Benefits paid	(6)	(8)
Projected benefit obligation, December 31	54	65	81
Change in plan assets:
Funded status	(54)	(65)
Amounts in the Consolidated Balance Sheets consist of:
Non-current assets	0	0
Current liabilities	(7)	(9)
Non-current liabilities	(47)	(56)
Net amount	(54)	(65)
Amounts in accumulated other comprehensive loss consist of:
Net actuarial loss	10	16
Net prior service (credit) cost	(13)	(16)
Net amount	(3)	0
Other postretirement employee benefits | Change In Projected Benefit Obligation
Change in projected benefit obligation:
Delphi Technologies acquisition	0	1
Change in plan assets:
Delphi Technologies acquisition	0	1
United States
Change in plan assets:
Funded status	(6)	(15)
United States | Pension benefits
Change in projected benefit obligation:
Projected benefit obligation, January 1	202	198
Service cost	0	0	0
Interest cost	3	5	8
Plan amendments	0	0
Settlement and curtailment	(4)	0
Actuarial (gain) loss	(7)	14
Currency translation	0	0
Benefits paid	(11)	(15)
Projected benefit obligation, December 31	183	202	198
Change in plan assets:
Fair value of plan assets, January 1	187	176
Actual return on plan assets	5	16
Employer contribution	0	10
Settlements	(4)	0
Currency translation	0	0
Benefits paid	(11)	(15)
Fair value of plan assets, December 31	177	187	176
Funded status	(6)	(15)
Amounts in the Consolidated Balance Sheets consist of:
Non-current assets	0	0
Current liabilities	(2)	(1)
Non-current liabilities	(4)	(14)
Net amount	(6)	(15)
Amounts in accumulated other comprehensive loss consist of:
Net actuarial loss	84	86
Net prior service (credit) cost	(3)	(4)
Net amount	81	82
Total accumulated benefit obligation for all plans	183	202
United States | Pension benefits | Change In Projected Benefit Obligation
Change in projected benefit obligation:
Delphi Technologies acquisition	0	0
Change in plan assets:
Delphi Technologies acquisition	0	0
United States | Pension benefits | Change In Plan Assets
Change in projected benefit obligation:
Delphi Technologies acquisition	0	0
Change in plan assets:
Delphi Technologies acquisition	0	0
Non-U.S. | Pension benefits
Change in projected benefit obligation:
Projected benefit obligation, January 1	2,527	695
Service cost	25	21	18
Interest cost	30	16	12
Plan amendments	1	0
Settlement and curtailment	(13)	(19)
Actuarial (gain) loss	(208)	161
Currency translation	(59)	147
Benefits paid	(76)	(36)
Projected benefit obligation, December 31	2,227	2,527	695
Change in plan assets:
Fair value of plan assets, January 1	2,041	505
Actual return on plan assets	110	83
Employer contribution	24	164
Settlements	(11)	(18)
Currency translation	(39)	115
Benefits paid	(76)	(36)
Fair value of plan assets, December 31	2,049	2,041	$ 505
Funded status	(178)	(486)
Amounts in the Consolidated Balance Sheets consist of:
Non-current assets	68	26
Current liabilities	(7)	(6)
Non-current liabilities	(239)	(506)
Net amount	(178)	(486)
Amounts in accumulated other comprehensive loss consist of:
Net actuarial loss	74	330
Net prior service (credit) cost	2	2
Net amount	76	332
Total accumulated benefit obligation for all plans	2,183	2,471
Non-U.S. | Pension benefits | Change In Projected Benefit Obligation
Change in projected benefit obligation:
Delphi Technologies acquisition	0	1,542
Change in plan assets:
Delphi Technologies acquisition	0	1,542
Non-U.S. | Pension benefits | Change In Plan Assets
Change in projected benefit obligation:
Delphi Technologies acquisition	0	1,228
Change in plan assets:
Delphi Technologies acquisition	$ 0	$ 1,228