
	2021
shares in millions	Number of Shares	Weighted Average Award Date Fair Value
RSUs at beginning of period	60	$	49.82
Awarded	29	77.28
Conversions to common stock	(20)	53.32
Forfeited	(2)	60.14
RSUs at end of period1	67	$	60.27
Aggregate intrinsic value of RSUs at end of period (dollars in millions)		$	6,547
Weighted average award date fair value
RSUs awarded in 2020		55.01
RSUs awarded in 2019		43.05

1.At December 31, 2021, the weighted average remaining term until delivery for the outstanding RSUs was approximately 1.2 years.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance shares, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options.

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