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Short and Long-Term Debt Exchangeable Senior Notes (Details)		4 Months Ended		9 Months Ended
	Jun. 02, 2021 USD ($) Years $ / shares shares	Sep. 30, 2021 USD ($)		Sep. 30, 2021 USD ($)		Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Convertible Debt [Line Items]
Long-term Debt, Gross		$ 3,044,000,000		$ 3,044,000,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 53,000,000	53,000,000	[1]	53,000,000	[1]
Amortization of deferred financing costs and debt discount (premium)				12,000,000		$ 8,000,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		97,000,000		97,000,000
Long-term Debt		2,947,000,000		2,947,000,000
Payments for purchase of Exchangeable Senior Notes hedge transactions	$ 67,000,000			67,000,000		0
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 30.6075
Proceeds from issuance of Exchangeable Senior Notes warrant transactions	$ 46,000,000			46,000,000		$ 0
0.25% Exchangeable Senior Notes | Convertible Debt
Convertible Debt [Line Items]
Long-term Debt, Gross	$ 403,000,000	$ 403,000,000		$ 403,000,000			$ 0
Interest Rate		0.25%		0.25%
Debt Instrument, Convertible, Conversion Ratio	40.8397
Debt Instrument Convertible Principal Amount	$ 1,000
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 24.49
Potential Conversion Shares Of Convertible Debt | shares	23,013,139
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Debt Instrument, Convertible, Threshold Trading Days | Years	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Years	30
Debt Instrument, Interest Rate, Effective Percentage	4.375%
Amortization of deferred financing costs and debt discount (premium)		$ 4,000,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		79,000,000		$ 79,000,000
Long-term Debt	$ 319,000,000	$ 324,000,000		$ 324,000,000			$ 0
Deferred income taxes	20,000,000
Deferred Tax Assets, Net	$ 18,000,000
0.25% Exchangeable Senior Notes | Convertible Debt | Maximum
Convertible Debt [Line Items]
Debt Instrument, Convertible, Conversion Ratio	57.1755
[1] Included in additional paid-in capital on the consolidated balance sheets.

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