Shareholders' Equity (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ (3,423)
Amounts reclassified from accumulated other comprehensive loss:
Total other comprehensive loss	$ (71)	$ (221)	(370)	$ (325)
Ending balance	(3,793)		(3,793)
Total
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(3,423)
Other comprehensive (loss) income before reclassifications, net			(477)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss			143
Tax benefit			(36)
Amounts reclassified from accumulated other comprehensive loss, net			107
Total other comprehensive loss			(370)
Ending balance	(3,793)		(3,793)
Change in Fair Value of Financial Instruments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(25)
Other comprehensive (loss) income before reclassifications, net			(16)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss			7
Tax benefit			(2)
Amounts reclassified from accumulated other comprehensive loss, net			5
Total other comprehensive loss			(11)
Ending balance	(36)		(36)
Foreign Currency Translation Adjustments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(771)
Other comprehensive (loss) income before reclassifications, net			(227)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss			0
Tax benefit			0
Amounts reclassified from accumulated other comprehensive loss, net			0
Total other comprehensive loss			(227)
Ending balance	(998)		(998)
Post-Retirement Benefit Obligation [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(2,627)
Other comprehensive (loss) income before reclassifications, net			(234)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss			136
Tax benefit			(34)
Amounts reclassified from accumulated other comprehensive loss, net			102
Total other comprehensive loss			(132)
Ending balance	$ (2,759)		$ (2,759)