Accumulated Other Comprehensive Loss (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Net Unrealized Gains (Losses) on Cash Flow Hedges	Jun. 30, 2013 Net Unrealized Gains (Losses) on Cash Flow Hedges	Jun. 30, 2014 Net Unrealized Gains (Losses) on Cash Flow Hedges	Jun. 30, 2013 Net Unrealized Gains (Losses) on Cash Flow Hedges	Jun. 30, 2014 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2013 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2014 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2013 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2014 Foreign Currency Translation Adjustment	Jun. 30, 2013 Foreign Currency Translation Adjustment	Jun. 30, 2013 Foreign Currency Translation Adjustment	Dec. 31, 2013 Foreign Currency Translation Adjustment	Jun. 30, 2014 Pension and Other Benefits Adjustment	Jun. 30, 2013 Pension and Other Benefits Adjustment	Jun. 30, 2014 Pension and Other Benefits Adjustment	Jun. 30, 2013 Pension and Other Benefits Adjustment
Change in accumulated other comprehensive loss balances:
Accumulated Other Comprehensive Loss, Beginning Balance	$ (559)	$ (561)	$ (624)	$ (514)	$ 7	$ 24	$ 16	$ 24	$ (260)	$ 95	$ (328)	$ 159	$ (5)		$ 1	$ (3)	$ (301)	$ (680)	$ (309)	$ (698)
Accumulated Other Comprehensive Loss, Other comprehensive income (loss) before reclassifications	137	(314)	210	(317)	42	2	47	6	95	(314)	165	(320)	2	(2)	(3)		(2)		(2)
Accumulated Other Comprehensive Loss, Amounts reclassified from accumulated other comprehensive loss	(19)	(4)	(27)	(48)	(17)	(5)	(31)	(9)	(8)	(16)	(10)	(74)					6	17	14	35
Accumulated Other Comprehensive Loss, Ending Balance	$ (441)	$ (879)	$ (441)	$ (879)	$ 32	$ 21	$ 32	$ 21	$ (173)	$ (235)	$ (173)	$ (235)	$ (3)	$ (2)	$ (2)	$ (3)	$ (297)	$ (663)	$ (297)	$ (663)