v3.10.0.1

Debt - Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jul. 31, 2014
Interest Rate Swap | Designated as Hedging Instrument | Fair Value Hedging
Debt Instrument [Line Items]
Derivative liability	$ 2,400		$ 2,400			$ 2,400
Senior Notes
Debt Instrument [Line Items]
Redemption price, percentage, in the event of change of control			101.00%
Interest expense	79	$ 83	$ 239	$ 225
Fair value of long-term debt	$ 9,100		9,100		$ 10,100
Senior Notes | 2.500% Senior notes due 2018
Debt Instrument [Line Items]
Debt repaid			$ 750
Coupon rate, fixed rate notes	2.50%		2.50%
Senior Notes | 3.800% Senior notes due 2022
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	3.80%		3.80%
Senior Notes | 6.000% Senior notes due 2056
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	6.00%		6.00%
Redemption price, percentage			100.00%
Senior Notes | 2.150% Senior notes due 2020
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	2.15%		2.15%
Senior Notes | 2.750% Senior notes due 2023
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	2.75%		2.75%
Senior Notes | 3.600% Senior notes due 2027
Debt Instrument [Line Items]
Coupon rate, fixed rate notes	3.60%		3.60%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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