Cash And Cash Equivalents Non-Cash Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
NON-CASH INVESTING ACTIVITIES:
Accrued capital expenditures	$ 1,011	$ 833
Losses from subsidiary common unit transactions	(103)	(52)
Non-Cash Financing [Abstract]
Capital Contributions from Noncontrolling Interest	$ 0	$ 988