Per Share Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings per share reconciliation [Abstract]
Net income (loss)	$ 114	$ 965	$ 572	$ 2,785
Dividends on redeemable non-controlling interests	$ (2)	$ (2)	$ (5)	$ (5)
Earnings (loss) per share: [Abstract]
Basic (in dollars per share)	$ 0.33	$ 2.85	$ 1.69	$ 7.72
Diluted (in dollars per share)	$ 0.33	$ 2.85	$ 1.69	$ 7.72
Continuing operations [Member]
Earnings per share reconciliation [Abstract]
Net income (loss)	$ 114	$ 969	$ 572	$ 2,792
Dividends on redeemable non-controlling interests	(2)	(2)	(5)	(5)
Net (income) loss attributable to participating securities	(1)	(2)	(2)	(5)
Net income (loss) attributable to ordinary shareholders - Basic	111	965	565	2,782
Net income (loss) attributable to ordinary shareholders - Diluted	$ 111	$ 965	$ 565	$ 2,782
Weighted average number of shares outstanding reconciliation [Abstract]
Basic weighted average common stock outstanding (in shares)	334	337	334	360
Effect of dilutive securities: [Abstract]
Effect of dilutive securities (in shares)	0	0	0	0
Potential dilutive shares (in shares)	334	337	334	360
Earnings (loss) per share: [Abstract]
Basic (in dollars per share)	$ 0.33	$ 2.86	$ 1.69	$ 7.74
Diluted (in dollars per share)	$ 0.33	$ 2.86	$ 1.69	$ 7.74
Discontinued operations [Member]
Earnings per share reconciliation [Abstract]
Net income (loss)	$ 0	$ (4)	$ 0	$ (7)
Dividends on redeemable non-controlling interests	0	0	0	0
Net (income) loss attributable to participating securities	0	0	0	0
Net income (loss) attributable to ordinary shareholders - Basic	0	(4)	0	(7)
Net income (loss) attributable to ordinary shareholders - Diluted	$ 0	$ (4)	$ 0	$ (7)
Weighted average number of shares outstanding reconciliation [Abstract]
Basic weighted average common stock outstanding (in shares)	334	337	334	360
Effect of dilutive securities: [Abstract]
Effect of dilutive securities (in shares)	0	0	0	0
Potential dilutive shares (in shares)	334	337	334	360
Earnings (loss) per share: [Abstract]
Basic (in dollars per share)	$ 0	$ (0.01)	$ 0	$ (0.02)
Diluted (in dollars per share)	$ 0	$ (0.01)	$ 0	$ (0.02)