Realignment Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Charges
Accrued Realignment Costs
Realignment Costs incurred	$ 55	$ 2
Executive Transition Costs | Realignment Program [Member]
Accrued Realignment Costs
Realignment Costs incurred	0	2
Employee Severance [Member]
Accrued Realignment Costs
Realignment Costs incurred	26
Balance - December 31, 2019	47
Payments made	35
Balance - March 31, 2019	38
Employee Severance [Member] | 2020 Fit for Growth [Member]
Accrued Realignment Costs
Realignment Costs incurred	26	0
Employee Retention Costs [Member] | Realignment Program [Member]
Accrued Realignment Costs
Realignment Costs incurred	6	0
Employee Retention Costs [Member] | 2020 Fit for Growth [Member]
Accrued Realignment Costs
Realignment Costs incurred	4	0
Other Restructuring | Realignment Program [Member]
Accrued Realignment Costs
Realignment Costs incurred	14	0
Exit From Content Related Services [Member] | 2020 Fit for Growth [Member]
Accrued Realignment Costs
Realignment Costs incurred	11
Facility Closing | 2020 Fit for Growth [Member]
Accrued Realignment Costs
Realignment Costs incurred	5	$ 0
Restructuring and Related Cost, Accelerated Depreciation	$ 3