Debt and Credit Facilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Proceeds from Issuance of Debt		$ 3,500
Commercial Paper	$ 100	$ 100	$ 0
Weighted Average Maturity, Commercial Paper		50 days
Debt, Long-term and Short-term, Combined Amount	6,848	$ 6,848	3,998
Debt, Current	135	135	768
Long-term debt, excluding current maturities	(6,713)	(6,713)	(3,230)
Unamortized Debt Issuance Expense	46	46	24
Line of Credit Facility, Remaining Borrowing Capacity	1,560	1,560	1,236
Debt Instrument, Fair Value Disclosure	7,118	$ 7,118	4,009
New Accounting Pronouncement, Early Adoption, Effect
Long-term debt, excluding current maturities			(24)
Senior Unsecured Notes 2.00% due 2016
Repayments of Secured Debt	$ 750
Debt Instrument, Interest Rate, Stated Percentage	2.00%	2.00%
Debt Instrument, Maturity Date		Sep. 30, 2016
Unsecured Debt	$ 0	$ 0	749
Senior Unsecured Notes 1.30% due 2018
Debt Instrument, Interest Rate, Stated Percentage	1.30%	1.30%
Debt Instrument, Maturity Date		Apr. 01, 2018
Unsecured Debt	$ 598	$ 598	597
Senior Unsecured Notes 2.000% due 2019
Debt Instrument, Interest Rate, Stated Percentage	2.00%	2.00%
Debt Instrument, Maturity Date		Mar. 08, 2019
Unsecured Debt	$ 746	$ 746	0
Senior Unsecured Notes 4.375% Due 2020
Debt Instrument, Interest Rate, Stated Percentage	4.375%	4.375%
Debt Instrument, Maturity Date		Jan. 15, 2020
Unsecured Debt	$ 497	$ 497	496
Senior Unsecured Notes 2.625% due 2021
Debt Instrument, Interest Rate, Stated Percentage	2.625%	2.625%
Debt Instrument, Maturity Date		Mar. 15, 2021
Unsecured Debt	$ 745	$ 745	0
Senior Unsecured Notes 3.375% due 2024
Debt Instrument, Interest Rate, Stated Percentage	3.375%	3.375%
Debt Instrument, Maturity Date		May 15, 2024
Unsecured Debt	$ 631	$ 631	606
Senior Unsecured Notes 3.375% due 2025
Debt Instrument, Interest Rate, Stated Percentage	3.375%	3.375%
Debt Instrument, Maturity Date		Nov. 01, 2025
Unsecured Debt	$ 744	$ 744	744
Senior Unsecured Notes 3.50% due 2026
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%
Debt Instrument, Maturity Date		Mar. 15, 2026
Unsecured Debt	$ 986	$ 986	0
Senior Unsecured Notes 4.10% due 2043
Debt Instrument, Interest Rate, Stated Percentage	4.10%	4.10%
Debt Instrument, Maturity Date		Apr. 01, 2043
Unsecured Debt	$ 391	$ 391	390
Senior Unsecured Notes 4.375% due 2044
Debt Instrument, Interest Rate, Stated Percentage	4.375%	4.375%
Debt Instrument, Maturity Date		May 15, 2044
Unsecured Debt	$ 394	$ 394	394
Senior Unsecured Notes 4.625% due 2018
Debt Instrument, Interest Rate, Stated Percentage	4.625%	4.625%
Debt Instrument, Maturity Date		Mar. 15, 2046
Unsecured Debt	$ 979	$ 979	0
Other Debt
Unsecured Debt	37	$ 37	$ 22
Commercial Paper
Borrowing Limit Increase	$ 250
Debt Instrument, Maturity		397 days
Short-term Debt, Weighted Average Interest Rate	0.70%	0.70%
Commercial Paper \| Maximum
Commercial paper	$ 1,500	$ 1,500
Line of Credit
Borrowing Limit Increase	250
Line of Credit \| Maximum
Commercial paper	$ 1,500	$ 1,500

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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