New Accounting Guidance New Accounting Guidance (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements
Prepaid expenses and other current assets	$ 1,847	$ 1,662
Noncurrent deferred and refundable income taxes	2,486	2,489
Other current liabilities	(1,593)	(1,671)
Other liabilities	$ (3,269)	(3,203)
New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements
Deferred and refundable income taxes		910
Prepaid expenses and other current assets		616
Noncurrent deferred and refundable income taxes		835
Other current liabilities		59
Other liabilities		$ 16