Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Jun. 23, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' Equity (Textuals) [Abstract]
Common Stock, Dividends, Per Share, Declared		$ 2.45	$ 1.9575	$ 1.4375
Stock Issued During Period, Shares, New Issues	61
Equity Issuance, Per Share Amount	$ 57.00
Common Units Sold In Offering	8
Proceeds from Issuance of Common Stock	$ 3,378	$ 27	$ 3,416	$ 18
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance		(341)
Other comprehensive income (loss)		(171)	(176)	198
Total, Ending Balance		(442)	(341)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance		(341)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(123)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		22
Other comprehensive income (loss)		(101)	(157)	$ 198
Total, Ending Balance		(442)	(341)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance		(1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(3)
Other comprehensive income (loss)		0
Total, Ending Balance		(1)	(1)
Foreign currency translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance		31
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(134)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0
Other comprehensive income (loss)		(134)
Total, Ending Balance		(103)	31
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance		(371)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		25
Other comprehensive income (loss)		33
Total, Ending Balance		$ (338)	$ (371)