Debt - Summary of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total long-term debt	$ 7,107	$ 7,745
Less current portion of long-term debt	(339)	(578)
Long-term debt less current portion	6,768	7,167
Notes [Member] \| Notes due 2018 [Member]
Debt Instrument [Line Items]
Notes	$ 0	$ 450
Debt instrument, stated interest rate (in percentage)	5.60%	5.60%
Related long term debt converted to floating interest rates by interest rate swaps	$ 415
Notes [Member] \| Notes due 2019 [Member]
Debt Instrument [Line Items]
Notes	$ 300	$ 300
Debt instrument, stated interest rate (in percentage)	6.95%	6.95%
Related long term debt converted to floating interest rates by interest rate swaps	$ 300
Notes [Member] \| Notes due 2021 [Member]
Debt Instrument [Line Items]
Notes	$ 300	$ 300
Debt instrument, stated interest rate (in percentage)	3.47%	3.47%
Related long term debt converted to floating interest rates by interest rate swaps	$ 275
Notes [Member] \| Notes due 2023 [Member]
Debt Instrument [Line Items]
Notes	$ 300	$ 300
Debt instrument, stated interest rate (in percentage)	3.68%	3.68%
Related long term debt converted to floating interest rates by interest rate swaps	$ 200
Notes [Member] \| Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Long term debt debentures	$ 629	$ 659
Debt instrument, stated interest rate (in percentage)	0.75%	0.75%
Notes [Member] \| Notes due 2037 [Member]
Debt Instrument [Line Items]
Notes	$ 240	$ 240
Debt instrument, stated interest rate (in percentage)	5.80%	5.80%
Notes [Member] \| Notes due from 2019 to 2035 [Member]
Debt Instrument [Line Items]
Notes	$ 203	$ 239
Related long term debt converted to floating interest rates by interest rate swaps	$ 50	$ 50
Notes [Member] \| Notes due from 2019 to 2035 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate (in percentage)	5.25%	5.25%
Notes [Member] \| Notes due from 2019 to 2035 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate (in percentage)	8.875%	8.875%
Debenture [Member] \| Debentures due 2020 [Member]
Debt Instrument [Line Items]
Long term debt debentures	$ 239	$ 239
Debt instrument, stated interest rate (in percentage)	3.875%	3.875%
Related long term debt converted to floating interest rates by interest rate swaps	$ 150
Debenture [Member] \| Debentures due 2022 [Member]
Debt Instrument [Line Items]
Long term debt debentures	$ 100	$ 100
Debt instrument, stated interest rate (in percentage)	8.10%	8.10%
Related long term debt converted to floating interest rates by interest rate swaps	$ 100
Debenture [Member] \| Debentures due 2025 [Member]
Debt Instrument [Line Items]
Long term debt debentures	$ 145	$ 145
Debt instrument, stated interest rate (in percentage)	6.50%	6.50%
Debenture [Member] \| Debentures due 2029 [Member]
Debt Instrument [Line Items]
Long term debt debentures	$ 200	$ 200
Debt instrument, stated interest rate (in percentage)	7.65%	7.65%
Related long term debt converted to floating interest rates by interest rate swaps	$ 50
Debenture [Member] \| Debentures due 2034 [Member]
Debt Instrument [Line Items]
Long term debt debentures	$ 136	$ 136
Debt instrument, stated interest rate (in percentage)	5.45%	5.45%
Related long term debt converted to floating interest rates by interest rate swaps	$ 25
Senior Notes [Member] \| Senior notes due 2022 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent	$ 1,600	$ 1,600
Debt instrument, stated interest rate (in percentage)	2.75%	2.75%
Related long term debt converted to floating interest rates by interest rate swaps	$ 1,400
Senior Notes [Member] \| Senior notes due 2027 [Member]
Debt Instrument [Line Items]
Notes	$ 700	$ 700
Debt instrument, stated interest rate (in percentage)	3.10%	3.10%
Senior Notes [Member] \| Senior notes due 2032 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent	$ 700	$ 700
Debt instrument, stated interest rate (in percentage)	4.00%	4.00%
Senior Notes [Member] \| Senior notes due 2042 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent	$ 1,000	$ 1,000
Debt instrument, stated interest rate (in percentage)	4.15%	4.15%
Senior Notes [Member] \| Senior notes due 2047 [Member]
Debt Instrument [Line Items]
Notes	$ 300	$ 300
Debt instrument, stated interest rate (in percentage)	3.92%	3.92%
Japanese Yen notes payable [Member] \| Japanese Yen notes due 2018 [Member]
Debt Instrument [Line Items]
Notes	$ 0	$ 88
Debt instrument, stated interest rate (in percentage)	4.215%	4.215%
Other long-term debt [Member]
Debt Instrument [Line Items]
Other	$ 15	$ 49

Long term debt debentures

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Related long-term debt converted to floating interest rates by interest rate swaps.

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

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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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Amount of long-term debt and capital lease obligations including current maturities.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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