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Unsecured senior notes- General (Details) ¥ in Millions, $ in Millions	1 Months Ended
	Nov. 30, 2019 USD ($)	Nov. 30, 2017 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 CNY (¥)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 CNY (¥)	Dec. 31, 2017 USD ($)	Nov. 30, 2014 USD ($)
Unsecured senior notes
Unsecured senior notes
Carrying value				¥ 77,486		¥ 80,616
Unamortized discount and debt issuance costs				501		550
Total principal amounts of unsecured senior notes				77,987		81,166
Non-current portion of principal amounts of unsecured senior notes				77,987		¥ 81,166
Discount when issued			$ 47	297
Debt issuance costs as a direct deduction from the principal amount			82	¥ 517
2014 Senior Notes
Unsecured senior notes
Principal amount | $								$ 8,000
Repayment amount | $	$ 2,250	$ 1,300
2017 Senior Notes
Unsecured senior notes
Principal amount | $							$ 7,000
US$1,500 million 3.125% notes due 2021 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 1,500		$ 1,500
Fixed interest rate			3.125%	3.125%	3.125%	3.125%
Carrying value				¥ 10,196		¥ 10,604
Effective interest rate			3.26%	3.26%
US$700 million 2.800% notes due 2023 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 700
Fixed interest rate			2.80%	2.80%	2.80%	2.80%
Carrying value				¥ 4,755		¥ 4,946
Effective interest rate			2.90%	2.90%
US$2,250 million 3.600% notes due 2024 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 2,250		$ 2,250
Fixed interest rate			3.60%	3.60%	3.60%	3.60%
Carrying value				¥ 15,274		¥ 15,891
Effective interest rate			3.68%	3.68%
US$2,550 million 3.400% notes due 2027 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 2,550		$ 2,550
Fixed interest rate			3.40%	3.40%	3.40%	3.40%
Carrying value				¥ 17,235		¥ 17,929
Effective interest rate			3.52%	3.52%
US$700 million 4.500% notes due 2034 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 700		$ 700
Fixed interest rate			4.50%	4.50%	4.50%	4.50%
Carrying value				¥ 4,715		¥ 4,906
Effective interest rate			4.60%	4.60%
US$1,000 million 4.000% notes due 2037 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 1,000		$ 1,000
Fixed interest rate			4.00%	4.00%	4.00%	4.00%
Carrying value				¥ 6,754		¥ 7,028
Effective interest rate			4.06%	4.06%
US$1,750 million 4.200% notes due 2047 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 1,750		$ 1,750
Fixed interest rate			4.20%	4.20%	4.20%	4.20%
Carrying value				¥ 11,811		¥ 12,291
Effective interest rate			4.25%	4.25%
US$1,000 million 4.400% notes due 2057 | Unsecured senior notes
Unsecured senior notes
Principal amount | $			$ 1,000		$ 1,000
Fixed interest rate			4.40%	4.40%	4.40%	4.40%
Carrying value				¥ 6,746		¥ 7,021
Effective interest rate			4.44%	4.44%

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