Financial Instruments - Foreign Exchange Risk Management (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	$ 1,161
Average maturity of foreign exchange hedging contracts - within three months (percent)	81.00%
Average maturity of foreign exchange hedging contracts - within three months and six months (percent)	9.00%
Average maturity of foreign exchange hedging contracts - within six and twelve months (percent)	10.00%
Exposure increase percent	6.40%
Derivative assets (liabilities), at fair value, net	$ 2	$ (5)
Japanese Yen/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	398
Euro/U.K. Pound Sterling
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	237
Japanese Yen/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	186
U.S. Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	90
U.S. Dollar/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	46
Euro/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	46
U.K. Pound Sterling/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	37
U.S. Dollar/Japanese Yen
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	31
Euro/Danish Krone
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	21
U.S. Dollar/Russian Ruble
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	15
U.S. Dollar/Israeli Shekel
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	9
U.S. Dollar/Brazilian Real
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	9
Euro/Norwegian Kroner
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	4
All Other
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	32
Foreign exchange contract
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	2
Foreign exchange contract | Japanese Yen/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	6
Foreign exchange contract | Euro/U.K. Pound Sterling
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | Japanese Yen/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(2)
Foreign exchange contract | U.S. Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(1)
Foreign exchange contract | U.S. Dollar/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(1)
Foreign exchange contract | Euro/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.K. Pound Sterling/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.S. Dollar/Japanese Yen
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | Euro/Danish Krone
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.S. Dollar/Russian Ruble
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.S. Dollar/Israeli Shekel
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.S. Dollar/Brazilian Real
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | Euro/Norwegian Kroner
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | All Other
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	$ 0