Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Debt and Lines of Credit - Additional Information (Details) - USD ($)	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2017	May 31, 2017	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Commercial paper	$ 0			$ 0		$ 0
Retirement of long-term debt	375,000,000		$ 250,000,000
Long-term debt, gross	3,600,000,000			3,600,000,000		3,600,000,000		$ 3,625,000,000
Proceeds from issuance of long-term debt						605,000,000	$ 499,000,000
Interest and debt expense				20,000,000	$ 21,000,000	38,000,000	$ 43,000,000
Notes payable
Debt Instrument [Line Items]
Long-term debt, gross		$ 600,000,000
Payments of debt issuance costs		3,000,000
Proceeds from issuance of long-term debt		605,000,000
Notes due 2021 at 2.75%
Debt Instrument [Line Items]
Long-term debt, gross	$ 550,000,000	$ 300,000,000		$ 550,000,000		$ 550,000,000		$ 250,000,000
Long-term debt stated interest rate (in percentage)	2.75%	2.75%		2.75%		2.75%		2.75%
Notes due 2024 at 2.625%
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000,000	$ 300,000,000		$ 300,000,000		$ 300,000,000		$ 0
Long-term debt stated interest rate (in percentage)	2.625%	2.625%		2.625%		2.625%		2.625%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2022	$ 2,000,000,000			$ 2,000,000,000		$ 2,000,000,000