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

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Debt - Fair Value, Activity, Letters of Credit, Borrowings and Repayments (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt
Short-term debt		$ 1,341		$ 1,715
Repayments of senior notes		400
Letters of credit
Debt
Outstanding letters of credit		77		73
Senior notes
Debt
Debt instrument face value		9,900		$ 10,300
Senior notes \| 6.13% senior notes due January 2016
Debt
Repayments of senior notes	$ 400
Debt instrument, interest rate	6.13%			6.13%
Senior notes \| Level 2
Debt
Debt instrument fair value		10,100		$ 10,400
Credit facilities and commercial paper program
Debt
Total borrowings		18,800	$ 10,800
Total repayments		19,200	$ 12,300
Exchange Traded
Debt
Short-term debt		$ 95		$ 410