Pension and Postretirement Benefit Plans - Reconciliations of Changes in Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan [Member]
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	$ 1,372,000,000
Fair value at end of period	802,000,000	$ 1,372,000,000
Pension Plan [Member] | UNITED STATES
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	1,501,000,000	1,730,000,000
Interest cost	40,000,000	43,000,000	$ 51,000,000
Service cost
Actuarial (gain) loss	13,000,000	(148,000,000)
Benefit payments	(90,000,000)	(124,000,000)
Acquisitions	161,000,000
Settlements	(853,000,000)
Translation adjustments
Obligation at end of period	772,000,000	1,501,000,000	1,730,000,000
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	1,301,000,000	1,513,000,000
Actual return on plan assets	171,000,000	(88,000,000)
Employer contributions	59,000,000
Benefit payments	(90,000,000)	(124,000,000)
Settlements	(853,000,000)
Acquisitions	136,000,000
Translation adjustments
Fair value at end of period	724,000,000	1,301,000,000	1,513,000,000
Funded status at end of period	(48,000,000)	(200,000,000)
Pension Plan [Member] | Foreign Plan [Member]
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	364,000,000	377,000,000
Interest cost	8,000,000	7,000,000	7,000,000
Service cost	8,000,000	7,000,000	7,000,000
Actuarial (gain) loss	41,000,000	7,000,000
Benefit payments	(14,000,000)	(14,000,000)
Acquisitions	25,000,000
Settlements	(13,000,000)	(2,000,000)
Curtailment	(1,000,000)
Translation adjustments	(6,000,000)	(18,000,000)
Obligation at end of period	412,000,000	364,000,000	377,000,000
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	71,000,000	71,000,000
Actual return on plan assets	11,000,000	6,000,000
Employer contributions	17,000,000	16,000,000
Benefit payments	(14,000,000)	(14,000,000)
Settlements	(13,000,000)	(2,000,000)
Acquisitions	7,000,000
Translation adjustments	(1,000,000)	(6,000,000)
Fair value at end of period	78,000,000	71,000,000	71,000,000
Funded status at end of period	(334,000,000)	(293,000,000)
Other Postretirement Benefits Plan [Member] | UNITED STATES
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	0
Interest cost	0
Actuarial (gain) loss	1,000,000
Benefit payments	(1,000,000)
Acquisitions	3,000,000
Obligation at end of period	3,000,000	0
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	0
Employer contributions	1,000,000
Benefit payments	(1,000,000)
Fair value at end of period	0	0
Funded status at end of period	(3,000,000)
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	83,000,000	99,000,000
Interest cost	3,000,000	3,000,000	3,000,000
Service cost		1,000,000	1,000,000
Actuarial (gain) loss	2,000,000	(7,000,000)
Benefit payments	(4,000,000)	(5,000,000)
Settlements
Translation adjustments	4,000,000	(8,000,000)
Obligation at end of period	88,000,000	83,000,000	99,000,000
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	0	0
Actual return on plan assets
Employer contributions	4,000,000	5,000,000
Benefit payments	(4,000,000)	(5,000,000)
Settlements
Translation adjustments
Fair value at end of period	0	0	$ 0
Funded status at end of period	$ (88,000,000)	$ (83,000,000)