Indebtedness (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 27,568	$ 25,278
Long-term Debt, Current	407	1,255
Long-term Debt	27,161	24,023
U.S. Dollar Notes [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	15,259	16,500
Due through	2043
Interest rate, minimum	0.277%
Interest rate, maximum	6.375%
Interest rate, average	3.878%
Euro Notes [Member] | Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	10,253	7,303
Due through	2033
Interest rate, minimum	1.75%
Interest rate, maximum	5.875%
Interest rate, average	3.104%
Swiss Franc Notes [Member] | Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	1,871	1,289
Due through	2024
Interest rate, minimum	0.75%
Interest rate, maximum	2.00%
Interest rate, average	1.217%
Other [Member] | Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 185	$ 186
Due through	2024
Interest rate, average	3.644%