Derivative Financial Instruments (Location And Fair Values Of Derivative Financial Instruments In Our Consolidated Statement Of Financial Position) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative assets fair value	$ 45	$ 72
Derivative liabilities fair value	4	1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	1	1
Derivative liabilities fair value	0	1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	1	1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	0	1
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Derivative assets fair value	44	71
Derivative liabilities fair value	4	0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	35	45
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	9	26
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	2	0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	$ 2	$ 0