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Debt Obligations (Changes in Debt Obligations) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Nov. 30, 2014
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 3,603,000,000
Additions	0
Payments, Accretion and Other	18,000,000
Debt obligations at end of period	3,621,000,000
Less current portion	(379,000,000)	$ 0
Payments (Accretions) And Other of Long-term Debt, Less current portion	0
Total long-term debt obligations	3,242,000,000	$ 3,603,000,000
Payments (Accretions) And Other of Long-term Debt, Total long-term debt obligations	18,000,000
$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 2.28% for the period January 1, 2017 through March 31, 2017)
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	399,000,000
Additions	0
Payments, Accretion and Other	0
Debt obligations at end of period	399,000,000
Less current portion	(10,000,000)
Credit facility, borrowing capacity	$ 400,000,000		$ 400,000,000
Interest rate during period	2.28%
Senior Notes | 5.55% senior unsecured notes due January 15, 2020
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 598,000,000
Additions	0
Payments, Accretion and Other	0
Debt obligations at end of period	$ 598,000,000
Stated rate	5.55%
Senior Notes | 5.25% senior unsecured notes due January 16, 2018
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 369,000,000
Additions	0
Payments, Accretion and Other	0
Debt obligations at end of period	$ 369,000,000
Stated rate	5.25%
Senior Notes | 3.875% senior unsecured notes due June 7, 2021
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 625,000,000
Additions	0
Payments, Accretion and Other	8,000,000
Debt obligations at end of period	$ 633,000,000
Stated rate	3.875%
Senior Notes | 4.25% senior unsecured notes due June 1, 2024
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 495,000,000
Additions	0
Payments, Accretion and Other	1,000,000
Debt obligations at end of period	$ 496,000,000
Stated rate	4.25%
Senior Notes | 1.75% senior unsecured notes due May 19, 2023
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 622,000,000
Additions	0
Payments, Accretion and Other	9,000,000
Debt obligations at end of period	$ 631,000,000
Stated rate	1.75%
Senior Notes | 3.85% senior unsecured notes due June 30, 2026
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 495,000,000
Additions	0
Payments, Accretion and Other	0
Debt obligations at end of period	$ 495,000,000
Stated rate	3.85%
Revolving Credit Facility | $750 million revolving credit commitment due November 25, 2019 (average interest rate of 0.00% for the period January 1, 2017 through March 31, 2017)
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 0
Additions	0
Payments, Accretion and Other	0
Debt obligations at end of period	0
Credit facility, borrowing capacity	$ 750,000,000			$ 750,000,000
Interest rate during period	0.00%

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Payments (Accretions) And Other of Long-term Debt, Excluding Current Maturities

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The average effective interest rate during the reporting period.

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

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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