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Debt Obligations - Schedule of Senior Notes and Loans (Detail) $ in Millions, ¥ in Billions	3 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 JPY (¥)
Debt Instrument [Line Items]
Total senior notes	$ 30,352	$ 28,367
Total loans		3,426
Other	5	20
Less current maturities	(786)	(2,880)
Derivative instruments	16	2
Less debt issuance costs	(137)	(106)
Total long-term debt	$ 29,450	28,829
Senior notes EUR 1,750 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	0.38%
Maturity	2020
Total senior notes	$ 2,152	2,095
Senior notes EUR 1,500 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.13%
Maturity	2024
Total senior notes	$ 1,837	1,788
Senior notes EUR 1,300 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.25%
Maturity	2023
Total senior notes	$ 1,593	1,550
Senior notes EUR 1,000 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.88%
Maturity	2019
Total senior notes		1,199
Senior notes EUR 900 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.50%
Maturity	2025
Total senior notes	$ 1,109
Senior notes EUR 750 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.63%
Maturity	2028
Total senior notes	$ 915	891
Senior notes EUR 700 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.25%
Maturity	2022
Total senior notes	$ 863
Senior notes EUR 700 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.88%
Maturity	2027
Total senior notes	$ 859	837
Senior notes USD 3,500 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.15%
Maturity	2026
Total senior notes	$ 3,492	3,492
Senior notes USD 3,000 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.20%
Maturity	2021
Total senior notes	$ 2,997	2,996
Senior notes USD 3,000 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.80%
Maturity	2023
Total senior notes	$ 2,992	2,992
Senior notes USD 2,000 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.70%
Maturity	2019
Total senior notes	$ 2,000	2,000
Senior notes USD 2,000 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.10%
Maturity	2046
Total senior notes	$ 1,984	1,984
Senior notes USD 1,500 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.40%
Maturity	2018
Total senior notes		1,500
Senior notes USD 1250 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	6.00%
Maturity	2024
Total senior notes	$ 1,250
Senior notes USD 1250 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	6.75%
Maturity	2028
Total senior notes	$ 1,250
Senior notes USD 844 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.95%
Maturity	2022
Total senior notes	$ 863	864
Senior notes USD 789 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	6.15%
Maturity	2036
Total senior notes	$ 781	781
Senior notes USD 700 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.25%
Maturity	2020
Total senior notes	$ 700	700
Senior notes USD 613 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.65%
Maturity	2021
Total senior notes	$ 623	624
Senior notes USD 588 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.65%
Maturity	2021
Total senior notes	$ 587	587
Senior notes CHF 450 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.50%
Maturity	2018
Total senior notes	$ 472	461
Senior notes CHF 350 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	0.50%
Maturity	2022
Total senior notes	$ 367	360
Senior notes CHF 350 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.00%
Maturity	2025
Total senior notes	$ 368	360
Senior notes CHF 300 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	0.13%
Maturity	2018
Total senior notes	$ 314	308
Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Total senior notes	$ (16)	(2)
Term loan USD 2.5 billion [Member]
Debt Instrument [Line Items]
Maturity	2018
Total loans		285
Term loan USD 2.5 billion [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Description of Variable Rate Basis	LIBOR +1.1375%
Basis Spread on Variable Rate	1.1375%
Term loan USD 2.5 billion [Member]
Debt Instrument [Line Items]
Maturity	2017
Maturity Start	2017
Maturity End	2020
Total loans		2,000
Term loan USD 2.5 billion [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Description of Variable Rate Basis	LIBOR +1.50%
Basis Spread on Variable Rate	1.50%
Term loan JPY 58.5 billion [Member]
Debt Instrument [Line Items]
Maturity	2022
Total loans		519
Less current maturities | ¥			¥ (28.3)
Term loan JPY 58.5 billion [Member] | London Interbank Offered Rate (LIBOR) [Member] | Japan, Yen
Debt Instrument [Line Items]
Description of Variable Rate Basis	JPY LIBOR +0.55%
Basis Spread on Variable Rate	0.55%
Term loan JPY 35 billion [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.42%
Maturity	2019
Total loans		311
Term loan JPY 35 billion [Member]
Debt Instrument [Line Items]
Maturity	2018
Total loans		311
Term loan JPY 35 billion [Member] | London Interbank Offered Rate (LIBOR) [Member] | Japan, Yen
Debt Instrument [Line Items]
Description of Variable Rate Basis	JPY LIBOR +0.3%
Basis Spread on Variable Rate	0.30%
Debentures USD 15 million [Member]
Debt Instrument [Line Items]
Weighted average interest rate	7.20%
Maturity	2018
Other		15
Other Debentures [Member]
Debt Instrument [Line Items]
Weighted average interest rate	7.31%
Maturity	2026
Other	$ 5	$ 5

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