Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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Face (par) amount of debt instrument at time of issuance.

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

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Weighted average interest rate of long-term debt outstanding.

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Amount of long-term debt classified as other, payable within one year or the operating cycle, if longer.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding.

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Debt - Components (Details) - USD ($)	Dec. 31, 2016	Aug. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Short-term debt:
Total short-term debt	$ 1,715,000,000		$ 999,000,000
Long-term debt:
Senior notes, net of unamortized discounts and debt issuance costs	9,874,000,000		9,698,000,000
Noncurrent portion of other long-term debt	250,000,000		677,000,000
Total long-term debt	10,124,000,000		10,375,000,000
Total debt	11,839,000,000		11,374,000,000
Senior notes
Long-term debt:
Unamortized discounts and debt issuance costs	(76,000,000)		(77,000,000)
Senior notes, net of unamortized discounts and debt issuance costs	9,874,000,000		9,698,000,000
Debt instrument face value	10,300,000,000		9,800,000,000
Other
Long-term debt:
Noncurrent portion of other long-term debt	3,000,000		5,000,000
Commercial Paper
Short-term debt:
Short-term notes and borrowings	$ 563,000,000		$ 696,000,000
Weighted average interest rate, short-term (as a percent)	1.60%		1.10%
Other
Short-term debt:
Other debt, current portion	$ 2,000,000		$ 3,000,000
Level 2 \| Senior notes
Long-term debt:
Debt instrument fair value	10,400,000,000		8,600,000,000
5.88% senior notes due August 2016 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs			$ 175,000,000
Debt instrument, interest rate (as a percent)		5.88%	5.88%
6.13% senior notes due January 2017 \| Senior notes
Short-term debt:
Senior notes, current portion	$ 400,000,000
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs			$ 400,000,000
Debt instrument, interest rate (as a percent)	6.13%		6.13%
6.50% senior notes due May 2018 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 600,000,000		$ 600,000,000
Debt instrument, interest rate (as a percent)	6.50%		6.50%
8.75% senior notes due May 2019 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 350,000,000		$ 350,000,000
Debt instrument, interest rate (as a percent)	8.75%		8.75%
2.60% senior notes due December 2019 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 500,000,000		$ 500,000,000
Debt instrument, interest rate (as a percent)	2.60%		2.60%	2.60%
Debt instrument face value				$ 500,000,000
5.75% senior notes due January 2020 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 500,000,000		$ 500,000,000
Debt instrument, interest rate (as a percent)	5.75%		5.75%
5.00% senior notes due February 2021 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 600,000,000		$ 600,000,000
Debt instrument, interest rate (as a percent)	5.00%		5.00%
3.65% senior notes due June 2022 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 750,000,000		$ 750,000,000
Debt instrument, interest rate (as a percent)	3.65%		3.65%
2.85% senior notes due January 2023 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 400,000,000		$ 400,000,000
Debt instrument, interest rate (as a percent)	2.85%		2.85%
3.85% senior notes due October 2023 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 700,000,000		$ 700,000,000
Debt instrument, interest rate (as a percent)	3.85%		3.85%
3.60% senior notes due November 2024 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 750,000,000		$ 750,000,000
Debt instrument, interest rate (as a percent)	3.60%		3.60%	3.60%
Debt instrument face value				$ 750,000,000
4.65% senior notes due October 2025 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 1,000,000,000		$ 1,000,000,000
Debt instrument, interest rate (as a percent)	4.65%		4.65%
Debt instrument face value			$ 1,000,000,000
4.50% senior notes due December 2026 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 750,000,000		0
Debt instrument, interest rate (as a percent)	4.50%
Debt instrument face value	$ 750,000,000
6.70% senior notes due May 2036 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 250,000,000		$ 250,000,000
Debt instrument, interest rate (as a percent)	6.70%		6.70%
6.65% senior notes due January 2037 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 600,000,000		$ 600,000,000
Debt instrument, interest rate (as a percent)	6.65%		6.65%
5.15% senior notes due June 2042 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 500,000,000		$ 500,000,000
Debt instrument, interest rate (as a percent)	5.15%		5.15%
4.30% senior notes due January 2043 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 350,000,000		$ 350,000,000
Debt instrument, interest rate (as a percent)	4.30%		4.30%
4.70% senior notes due June 2044 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 700,000,000		$ 700,000,000
Debt instrument, interest rate (as a percent)	4.70%		4.70%	4.70%
Debt instrument face value				$ 700,000,000
4.90% senior notes due February 2045 \| Senior notes
Long-term debt:
Long-term debt, before deducting unamortized discounts and debt issuance costs	$ 650,000,000		$ 650,000,000
Debt instrument, interest rate (as a percent)	4.90%		4.90%	4.90%
Debt instrument face value				$ 650,000,000
Commercial Paper
Long-term debt:
Noncurrent portion of other long-term debt	$ 247,000,000		$ 672,000,000
Weighted average interest rate, long-term (as a percent)	1.60%		1.10%
Senior secured hedged inventory facility \| Line of Credit
Short-term debt:
Short-term notes and borrowings	$ 750,000,000		$ 300,000,000
Weighted average interest rate, short-term (as a percent)	1.80%		1.40%
Exchange Traded
Short-term debt:
Total short-term debt	$ 410,000,000