Indebtedness (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 26,395	$ 25,278
Long-term Debt, Current	406	1,255
Long-term Debt	25,989	24,023
U.S. Dollar Notes [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	15,258	16,500
US Dollar Notes [Member] | U.S. Dollar Notes [Member]
Debt Instrument [Line Items]
Due through	2043
Interest rate, minimum	0.284%
Interest rate, maximum	6.375%
Interest rate, average	3.878%
Foreign Currency Obligations [Member] | Euro Notes [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	9,659	7,303
Due through	2033
Interest rate, minimum	1.75%
Interest rate, maximum	5.875%
Interest rate, average	3.12%
Foreign Currency Obligations [Member] | Swiss Franc Notes [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	1,293	1,289
Due through	2021
Interest rate, minimum	0.875%
Interest rate, maximum	2.00%
Interest rate, average	1.24%
Foreign Currency Obligations [Member] | Other [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 185	$ 186
Due through	2024
Interest rate, average	3.615%