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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Debt and Lines of Credit - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Commercial paper		$ 0		$ 0
Long-term debt, gross		3,625,000,000		3,625,000,000		$ 4,125,000,000
Proceeds from issuance of long-term debt				499,000,000	$ 498,000,000
Retirement of long-term debt	$ 1,000,000,000
Interest and debt expense		21,000,000	$ 24,000,000	43,000,000	$ 46,000,000
Consortium of investment-grade banks \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2021		2,000,000,000		2,000,000,000
Notes due 2022 at 1.85%
Debt Instrument [Line Items]
Long-term debt, gross	500,000,000	$ 500,000,000		$ 500,000,000		$ 0
Payments of debt issuance costs	3,000,000
Proceeds from issuance of long-term debt	$ 499,000,000