Derivative Financial Instruments and Risk Management (Details 4) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss)
Interest Expense	$ 150	$ 200	$ 325	$ 401
Other income (expense)	(6)	(6)	(16)	(10)
Designated derivatives | Cash flow hedges
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Recognized in AOCI	(44)	(24)	42	(28)
Amount of Gains (Losses) Reclassified from AOCI	(53)	3	24	17
Designated derivatives | Cash flow hedges | Interest rate contracts
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Recognized in AOCI	(9)	(34)	(24)	(60)
Designated derivatives | Cash flow hedges | Interest rate contracts | Interest expense
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Reclassified from AOCI	(19)	0	(24)	1
Interest Expense	150	200	325	401
Designated derivatives | Cash flow hedges | Cross currency contracts
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Recognized in AOCI	(35)	10	66	32
Designated derivatives | Cash flow hedges | Cross currency contracts | Interest expense
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Reclassified from AOCI	9	7	20	14
Interest Expense	150	200	325	401
Designated derivatives | Cash flow hedges | Cross currency contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Amount of Gains (Losses) Reclassified from AOCI	(43)	(4)	28	2
Other income (expense)	(6)	(6)	(16)	(10)
Undesignated derivatives
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	(23)	(10)	85	(39)
Undesignated derivatives | Foreign exchange contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	(24)	(9)	75	(38)
Undesignated derivatives | Cross currency contracts | Other income (expense)
Derivative Instruments, Gain (Loss)
Gains (Losses) on Derivatives Not Designated as Hedging Instruments	$ 1	$ (1)	$ 10	$ (1)