Per Share Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings per share reconciliation [Abstract]
Net income (loss)	$ 144	$ 817
Dividends on redeemable non-controlling interests	$ (2)	$ (2)
Earnings (loss) per share: [Abstract]
Basic (in dollars per share)	$ 0.42	$ 2.19
Diluted (in dollars per share)	$ 0.42	$ 2.19
Continuing operations [Member]
Earnings per share reconciliation [Abstract]
Net income (loss)	$ 143	$ 817
Dividends on redeemable non-controlling interests	(2)	(2)
Net income attributable to participating securities	0	(1)
Net income (loss) attributable to ordinary shareholders - Basic	141	814
Net income (loss) attributable to ordinary shareholders - Diluted	$ 141	$ 814
Weighted average number of shares outstanding reconciliation [Abstract]
Basic weighted average common stock outstanding (in shares)	334	372
Effect of dilutive securities: [Abstract]
Effect of dilutive securities (in shares)	0	0
Potential dilutive shares (in shares)	334	372
Earnings (loss) per share: [Abstract]
Basic (in dollars per share)	$ 0.42	$ 2.19
Diluted (in dollars per share)	$ 0.42	$ 2.19
Discontinued operations [Member]
Earnings per share reconciliation [Abstract]
Net income (loss)	$ 1	$ 0
Dividends on redeemable non-controlling interests	0	0
Net income attributable to participating securities	0	0
Net income (loss) attributable to ordinary shareholders - Basic	1	0
Net income (loss) attributable to ordinary shareholders - Diluted	$ 1	$ 0
Weighted average number of shares outstanding reconciliation [Abstract]
Basic weighted average common stock outstanding (in shares)	334	372
Effect of dilutive securities: [Abstract]
Effect of dilutive securities (in shares)	0	0
Potential dilutive shares (in shares)	334	372
Earnings (loss) per share: [Abstract]
Basic (in dollars per share)	$ 0	$ 0
Diluted (in dollars per share)	$ 0	$ 0