Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Consolidated Statements of Cash Flows [Abstract]
Cash and cash equivalents per Consolidated Balance Sheets	$ 30,231	$ 32,927	$ 26,168	$ 25,208
Restricted cash included in Other assets per Consolidated Balance Sheets	1,032	337	2,087	286
Total Cash, cash equivalents and restricted cash	$ 31,263	$ 33,264	$ 28,255	$ 25,494