Income Taxes - Narrative (Details) $ in Millions	3 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) Installment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Income Taxes [Line Items]
Income tax expense		$ 249	$ 6
Income (loss) before income taxes		(368)	(38)
Net discrete tax adjustments		$ 290	$ 7
U.S. statutory rate		21.00%	21.00%
Non-cash goodwill impairment charge		$ 182	$ 0
Deferred tax asset, tax credit carryforwards, foreign		$ 108		$ 403
CARES act of 2020, net operating loss carryback period		5 years
Number of equal annual installments to receive refund alternative minimum tax credit carryforwards | Installment		2
Scenario Forecast
Income Taxes [Line Items]
CARES Act Of 2020 refundable alternative minimum tax credit carryforwards	$ 5
Domestic and State and Local Authority
Income Taxes [Line Items]
Net deferred tax assets		$ 1,000
Valuation allowance		308
Foreign Tax Authority
Income Taxes [Line Items]
Valuation allowance		939
Tax credit carryforward, valuation allowance		$ 295		$ 3
Tax credit carryforward expiration year		2025
Deferred tax assets		$ 1,200
Foreign Tax Authority | Luxembourg
Income Taxes [Line Items]
Valuation allowance		$ 850
Foreign Tax Authority | Beginning Year
Income Taxes [Line Items]
Tax credit carryforward expiration year		2025
Foreign Tax Authority | Ending Year
Income Taxes [Line Items]
Tax credit carryforward expiration year		2028