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Debt - Senior Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
Debt Instrument [Line Items]
Repayments of senior notes	$ 1,000,000,000	$ 1,350,000,000
Senior notes
Debt Instrument [Line Items]
Debt instrument face value	$ 9,000,000,000.0		$ 9,000,000,000.0
Senior notes | 3.55% senior notes due December 2029
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	3.55%
Offering price percentage	99.801%
Debt instrument face value	$ 1,000,000,000
Senior notes | 2.60% senior notes due December 2019
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	2.60%		2.60%
Debt instrument face value			$ 500,000,000
Repayments of senior notes	$ 500,000,000
Senior notes | 5.75% senior notes due January 2020
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	5.75%		5.75%
Repayments of senior notes	$ 500,000,000
Senior notes | 6.13% senior notes due January 2017
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		6.13%
Repayments of senior notes		$ 400,000,000
Senior notes | 6.50% senior notes due May 2018
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		6.50%
Repayments of senior notes		$ 600,000,000
Senior notes | 8.75% senior notes due May 2019
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		8.75%
Repayments of senior notes		$ 350,000,000
Consolidated finance subsidiary co-issuer
Debt Instrument [Line Items]
Consolidated subsidiary, ownership interest held by the parent (as a percent)	100.00%
Other income/(expense), net | Senior notes
Debt Instrument [Line Items]
Loss on early redemption of senior notes		$ 40,000,000

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